I'm a big fan of your work.
Have you ever considered adding optional magic rules that don't use HP to cast?
Viewing post in ItDR v2.4 and plans for the future
Well, Thaumaturges kinda already do that, plus you can expect to see a couple of entirely new casting Features in the first supplement I’m working on right now. Also, you might be interested in a similar discussion here: https://github.com/Vladar4/itdr/issues/3#issuecomment-767401043