Mod Idea - spend XP to replace spells after level 12

[Aladrieth]

I recently finished my first playthrough of the game, and by the end I had just under 100k XP over the level 12 cap. I understand the game is balanced for level 12 characters, so I don't want to use one of the mods that introduces extra levels. But I do think that classes like Bard, Sorcerer, Warlock, etc should be able to get the "replace spell" option every now and then after reaching level 12. Granted, the gold cost of a full re-spec is negligible by that point, but it's a hassle to go through the full level progression just to change 1 or 2 spells in your spellbook. I think it would be a nice solution if there were XP tiers after level 12 where classes that have the "replace spell" feature when levelling could access said feature again.