Probably not? And magichanged monsters should get 100% of the exp as the humanoid, so I guess they should get bonus exp from the bonus reward? (the second one should be easy to test, just check the exp to next level before and after clearing with another unit)

I'm pretty sure a monster can't spawn lovers if they are magichanged. As for the bonus EXP, I don't really know, but the amount is negligible compared to what you're gaining from the mobs anyway.

With that said, I'd recommend using another monster to magichange and taking your mothman out the base just to farm its lovers, as IW runners don't really need any lvs or stats other than mov. If you reaaaaly want to level your mothman, create another one just to farm the lovers and delete it afterwards.

Thanks for the clarification, and thats a good one, I can make another moth for the lovers, and give them to my IW moth! Thanks!