Firstly approach all the owners as if it were a cost share. It sounds like a pick up and drop off so he won't be hanging around and you get half the flying and that shouldn't bugga the insurance if he is on board. Most owners like to use their aeroplanes and its good for both soul and engine.
Alternatively approach The Federal magistrates Court to amend the contact arrangements to get the Mother to share the driving one way. or meet half way. I bet she'll soon get tired of that.
Armed with that, note the next paragraphs.
Have you thought about private hire or a joint ownership of a C172 or something similar.
Yes yes, I know the answer, but what you want, and what you need, are two different aeroplanes.
Also a lot of owners simply won't lend you their pride and joy. Ask anybody who owns a taildragger. Don't feel bad about that.