There is no justification for declining to give a “get” when ordered to by a Beis Din, or even refusing to give a “get” while refusing to support’s one’s wife and children. Perhaps the only reason to refuse is in the hope the wife will change her mind, in which case the husband should still be paying her bills, and in such situations once the Beis Din rules on the matter it is over and he has to give the “get”.
On the other hand, there was a tradion of having a “Theives’s shul” and some prisons are known to have regular minyans, so why not a shul for those who are refusing to give a “get”.