But you want to start at level 10? How about Larian just give us God mode?
NWN1 - HOTU has you starting at lv 15.
NWN2 - MOTB I beieve thta you start at lv 18(not sure)
BG2 - Has you starting around lv 7~8 (different classes required different XP to level up on 2e)
None of then give "God mode".