[Lava]

(...) Foundling use is a mix of Shadow Weave spells and Shadow Magic. (...)

I think you missed that part. That is intentional and using both kinds of magic is mentioned in the dialogues. Also, it was all discussed already: https://forums.beamdog.com/discussion/co...nt_1007869

Replacing the original kit would mean much content is lost, some additions (like additional spells he may learn later) stop making sense. There are talks triggered by picking specific HLA - those would also be purged. 

This mod is complete. If we decide - with AionZ - that we want to make some kind of combination, then maybe, but neither of those mods was written to be used the way you describe it. For now, I have different priorities. Sorry.