Ceiling joists hung below top plate
There are many steel building hardware options. Simple joist hangers would do if you don't mind adding studs on the other side of each joist. I'd probably sister 2x10 or other suitable joists and use double hangers. 

One other option might be to bolt a ledger to the wall under the joists, giving them bearing. You'd have to box it out or fur out the entire wall to conceal it. 

I'd just have a conversation with your local inspector and see what (s)he'll be expecting and what options are available.