So the argument is that the bonuses were a legal obligation made before the bail-out. Apart from that being obvious bullshit, there is a simple solution to this problem that will avoid the legal quagmire:
Simply ask for the money back, and then publish the names and home-addresses of those that decline! You could print them in newspapers, or on huge billboards, together with driving directions, gun adverts and bomb making instructions.
The “talent” will swiftly and willingly comply.