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it is a little late but if anyone finds this thread, i want to add some final notes. i've recently found a chance to try this mod. not exactly i've been looking for but it works. Dawnguard Dark Ally - Radiant quests for Vampire Lord this mod, as @notmyhome advised, is meant to help player to interact with dawnguard AFTER main quest line. this mod works without scripts, just making you ally to dawnguard members depending on how much vampire dust u have. 100 vampire dust is required to interact with isran. but when Isran sees that you are a vampire, main quest gets stuck at that stage. right at that moment, to go further on main quest setstage might work, but as i said at first post, attacking isran with a ranged attack while he stands in balcony, triggers something and gets doors open. so you can continue main quest. at this moment, this mod starts to shine, and you can finish main quest without having to cure vampirism. a little buggy, a little workaround, but it works well. problem solved. BTW, NOTE FOR BETTER VAMPIRE USERS: Better Vampires mod has an option to add vampire hunters(off as default). turn that off if it is on, becouse these hunters becomes ally to you when you are ally to dawnguard. if you kill them, especially dawnguard hunters, that makes dawnguard members to attack you on sight, while you are still some kind of ally to them with dusts in your pocket, things get really awkward. just turn that vampire hunter option off until you are done with dawnguard.

i think this one works. tho i wonder, does this change cause any kind of trouble?

@notmyhome thanks a lot, that would be helpful.

i have completed quests. if u "setstage" "Rising at Dawn" quest, it cures your vampirism. later, u can be vampire again, before entering "Soul Cairn" but isran, again, wants you to cure vampirism and none of dawnguards interract with you while you are vampire. u need to "setstage" main quest, for isran to help your last assoult to castle volkihar. Result; isran and dawnguard will never accept you while you are vampire, even though he accepts serena at the end of questline.

actually i could start the quest as a vampire, isran didnt make it problem untill i enter dawnguard castle with Gunmar and Sorine to check if any of us is vampire. i tried "Vampire - Mortal's Mask" with all other illusion spells. didnt work... also i've added myself to dawnguard faction via console with "addtofaction" command, added isran to "Player Ally Faction" and "PotentialFollowerFaction"... it may be about quest stage. i need to see what is my rank and status in dawnguard faction. maybe a detailed info mod would be helpful, "STATUS" is not showing these kind of info.

i've started a vampire character to try the mod "Better Vampires" (http://www.nexusmods.com/skyrim/mods/9717/?). at mid (25-30) levels, i started dawnguard main quest. i didn't want to join Harkon and his "family", i wanted to be a good vampire and help dawnguard to hunt vampires. Isran didn't seem to make it a problem at first, so i choose joining dawnguard. i didn't continue main quest there and continued playing with other quests, to increase my vampire rank, feed hundreds of (fresh) dead bodies (Better Vampires feature) and sleeping people. anyway, after i made progress as a vampire, i went back to isran's quest, "A New Order" to recruit "Gunmar" and "Sorine". i convinced them to help isran and went back to castle dawnguard with them. even tho i went there at midnight, and hid to corner, isran saw that i was a vampire (that was obvius already, and i would say if he would ask). He wanted me to cure, but i have a lot of progress as vampire, i am at the last rank -Vampiris Praeceptor-. i need to convince isran that i'm a good guy (no i'm not, i just want to kill other vampires and feed them -Better Vampires feature) and continue with the dawnguard main quest without curing myself. --- sum: i am a vampire and i want to join dawnguard and hunt other vampires. i need to convince isran that i want to help them while i stay as a vampire. --- i tried something at this moment. i have attacked to isran (while he stands at the balcony to check if we are vampires). strangely, doors opened and next quest ("Prophet") has started. serena was up there near isran and came to talk about prophecy and ask dawnguard's help. but isran and other dawnguard recruits dont talk to me and say that i need to cure, i am a monster. so quest stucks there. also i fully perked and mastered illusion school (on Skyre overhoul mod) and tried to "calm" isran down but it didnt work either. even i tried to make isran a vampire and my thrall ("Praestare Sanguinare" -Better Vampires feature) but still he insists that i need to cure. i didnt save these attempts. my last save is where isran waits for my cure. i went back to horkan but that castle is close, too. noone accepts me. i'm so lonely...

+1 to this request. also i wonder, is it impossible?