‘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. ‘
Correct.
“requiring him, per halacha, to give it even if they cannot compel him.”
I would trust responsible beit dins consisting of rabbis who have spent years studying for yoreh yoreh and yadin yadin semicha over some anonymous internet commenter.