Sign Bowen.
He's no dirtier than Posey or Perkins, who we all cheer(ed).
Furthermore, while his days of starting are over, at best he'd be the 4th wing, averaging 5-10 mpg. He could fit the role nicely, hitting the open weakside three and playing tough defense.
As for Bill Walker/J.R. Giddens, who cares? They're rookies. As for Walker, if we bury him one more year, we can sign him cheap for a third year, and get Bird rights on him in case he blows up the year after. And if Bowen is really washed up and Walker/Giddens is any good, it won't be a big deal to see one of them beat him out later in the year.
The only way Bowen is a bad move at the minimum is if there is a better vet. option out there, and I'm not seeing it.