Oh cool, for the time being, I will just limit my self to casting spells from second level on myself, I guess. I hope you can find a way to make it work.
Btw, I noticed, that the ring that doubles the first level spells does not give the ability advertised in the readme, but rather adds one lvl1 cast as well as one lvl1 slot. I think this is just fine, but might be an oversight.
Sadly I haven't gotten the Arcanist Identify to work. maybe a conflict with spel_rev?
EDIT: Another thing I noticed is, that it takes two rests after choosing new spells to have them memorised. When the script switches to 5e-mode, I have to rest again to be able to cast them. Might be by design, but I noticed that after character creation, the script directly adds the unspent casts after switching to 5e style.