Machine Transcendance is the perfect match for Bone Scrivening. It not only gives you ample surface area on which to transcribe spells, it also lets you use technological methods to pack more spells in the same space. Like… a LOT more spells. Writing really small spells is literally the basis for modern technology.

Not only that, you could have equippab’e discs or tablets with different spell loadouts on them, which should bypass the strength reset when modifying spells.