Browning is interesting. It'd be a gamble, but I can see some parallels with the Hasselbeck trade. He led the league in completion percentage last year, but also averaged 8.0 yards per attempt, so he wasn't just dinking and dunking. For reference, that 8.0 number ranked fourth in the league last year and is the exact number Josh Allen is averaging this year. He looks like a fighter out there.
I think Levis could be a worthy reclamation project, but as an affordable backup, not a starter. Granted, I thought the same about Sam Howell, so what do I know.
It doesn't really make any sense for the Bucs to trade Baker or the Rams to trade Stafford. Richardson has some talent, but he's too injury prone for me. I can't really think of anyone else; definitely not anyone who is an obvious upgrade over Geno.