Sorry, I guess I didn't express myself correctly. I already have Vortex installed, and pretty much all the mods I'll be using (except DynDOLOD and a Bashed Patch). What I meant is that I don't know how Vortex would manage my installed mod if I reinstalled just the game, leaving the mods as they are now (and saving the hassle of having to reinstall them all).
When I said that I didn't know how Vortex works I meant that I have no clue about the inner workings or the program.
Yea, as I said in my first post, Vortex will just ignore the mods because they weren't installed with Vortex, which is going to cause you trouble in the future, because Vortex, like other mod managers keep track of each file they install/uninstall, so if you happen to install a mod with Vortex that overwrites the files from a mod you already have installed, and then you uninstall it, those files from the preinstalled mods, are going to disappear and mess up your pre-installed mods, because Vortex doesn't know about those files.
In other words, leaving mods installed that you installed manually, or with another mod manger, then using another mod manager is eventually going to cause a lot of headaches.
Either stick with the mods you already have installed, or uninstall all your old mods with whichever mod manager you installed them with, and start CLEAN.