Galactic Magic Houseruling Immortal Tutor

[Half elven gnomic dwarf]

how would you house rule a technomancer with a shapeshifting chaotic good celestial as immortal tutor that straddles the fence between celestial and protean? i was thinking...

the celestial spell and first lesson...

the protean spell and its first lesson and third lesson...

neither's second lesson...

but with two spells might be OP... and besides flavor I think this should be houseruled into something balanced, how would you do it?

[Metaphysician]

I would say, with GM approval, just pick one of the choices for each level. I wouldn't allow this for any arbitrary mismatch of tutors, but if you have a valid concept for running the boundary between two, it shouldn't be too problematic.

[Half elven gnomic dwarf]

well I am thinking the tutor could be a shapeshifitng cg celestial... maybe the first lesson of celestial the first lesson of protean, the spell of both, but the second and third lesson of neither...