If EVERYONE in the family and freinds turns him away then he's in a huge pile of doo doo...
You just need a good family who would be willing to support the marriage by refusing your husband any access to escape to...
You want him on the run with no exits in sight other than OW.. You already know he can't stay there... I suspect if he moved in with OW and OWM that reality for OW and OWM would start hitting them like a baseball bat.. he would be groaning about his pain and doing nothing about it in THIER home and they would likley get tired of him a LOT FASTER... moving into someone's home spoils fantasy's pretty fast... especially when mom is there too
