I've been offline a few days so just caught up with this - hope things are settling and the pain is easing a bit now as well as OH's views
I reckon if you can sell some of the weaners at a decent price he might relent on the mums, like you say it's a compromise and at least if you're able to work via wheelchair he'll see you doing your best and meet you half way
I'm a bit far to offer help aswell as clueless about pigs
but I've a friend who has horses on livery at an organic veg farm that rear piglets occasionally in Leicestershire so they might know someone if not interested themselves - I don't know what info they need but I'm happy to pass it on if you have an ad?
Meantime you can also get those indoor jobs updated while you're resting - accounts, seed orders, invoices paid, plans, web info, marketing leaflets, any calls you hadn't time to make etc and look at drawing up a plan to change your pig organisation while you're at it so you can show OH how you plan to avoid future problems
Best of luck