Hi y not,
Let me ease Lal’s burden a bit and attempt to answer some of your questions (he has just come back from travelling and may be somewhat depleted of energy :))
y not said: ‘Any other kamma vipaka CAN be overcome by attaining a magga phala (at least the Sotapanna stage)’ -which addresses my question itself. So one can overcome any outcome of a kamma vipaka, any bhava, that may at that moment present itself?… human,deva,rupa, arupa?’
A sotapanna has only managed to overcome apayagami kamma due to overcoming three sanyojanas of sathkaya ditthi, vicikicca, silabbata paramasa, or one asava (ditthisava). He still has seven sanyojanas and three asavas left (kamasava, bhavasava, and avijjasava). Kama sava will keep him bound to kama loka (or the realms of sensual desire), while bhavasava will keep him bound to the rupa and arupalokas, I think. So he will still experience various kamma vipaka, as long as those are not of the apayagami sort, and he will undergo rebirths as long as bhavasava and avijjasava remain.
Even an arahant or a fully enlightened Buddha experiences kamma vipaka, up until right before parinibbana, even if they have discarded all asavas and sanyojanas.