I agree with you on the discs, calipers etc because if they work properly, they will work BUT for such a small outlay, I would definitely change the pads.A few hundred miles of driving jock and those discs will be shiny again its just surface rust with not being used . The calipers are perfect now and the pads ARE not crumbling . The only damage to the pads was caused by me prising the caliper back with a prise bar through the inspection plate.
They'll be fine
They definitely look dodgy and you broke a piece off with the bar, what other internal structure damage you might have done?
Don't take the risk on the front brakes that do most of the braking.
PS. Not that I'm interested in buying your other van (I'm happy with the one I have) but is there a reason why I've not seen it on 'classified', some of us don't do eBay?