Well, Shaak Ti hired some bounty hunters to help her train some of the Clones on Kamino. I'll drop the Mandalorian idea and just go with a full bounty hunter, since it was canon that the Republic utilized them just as much as anyone else did.

If you don't mind, Sep, answer me this: let us assume Jango and Windu fought to a stalemate on Geonosis. Clone Troopers come to the rescue... what does Jango do? Does he fight his own Clones, join them in the rescue, or fly off with Boba?