"I'll take that bet, Branyan doesn't get the bat on the ball enough (or walk) to do that IMO.
Branyan had a .349 OB% in 2100 ML ab's and a .320 in 1003 MLB AB's. In the ML he K'd every 2.55 AB in MLB it's every 2.44 (Dunn every 3.1)
Hummel has roughly (since I don't know his HBP or SF) a .358 OB% in 1700 ML ab's."
It's possible that he OBs better than Branyan, but I'll bet the ranch he doesn't out-OPS Branyan.
Hummel's fine bench ballast or an upgrade to Juan Castro if Branyan isn't available, but he's hardly a Prospect (with a capital P).
Also, except for Dunn, the Reds won't have a whole lot of left-handed power (assuming-correctly-that Griffey will see sporadic action at best).
I suppose what would work well enough would be to play Hummel at third and Branyan in the outfield next to Kearns and Dunn. But who plays short?