I'm not sure any of these guys are that much of an upgrade in talent, and I would expect a dropoff in execution (more TO's, etc.) while they learn the system. If it costs games in the interim, or we play a shorter rotation while they come up to speed, it could mean losing home court (which I hope is an) advantage in the playoffs. So I'd call it a high risk/low reward deal that's being suggested.
While agreeing with the premise that we could use a backup PG and athletic wing, preferably one that can score, I'm not so sure we need another big, though. And there are easier ways to go about this (ATTENTION, DOC!!!):
PG: Lue might be suitable as insurance/short minutes (10mpg) for minimum money.
Wing: Well...I'm sure there's a reason Doc doesn't play the guys that don't play, but if they might be needed in the playoffs...then Bill Walker needs to get some run, and not just in garbage time, like Doc does things now, or the D-League, against (and with) inferior players, but alongside the regulars. They'll develop better skills, and also chemistry with the guys they'd be playing with. (Disclaimer: I do think Pavlovic is better than walker...)
Another idea, derived from that: Bring Ray Allen off the bench. (WAIT! DON'T SHOOT!)
Rondo and Perk's emergence as offensive threats make the 1st line too loaded with offense (with KG...), or rather, the dropoff to the 2nd unit is too steep. Start someone else, and let Ray lead the 2nd unit. Besides, that's what he should be doing these (old) days, anyway (and for the next 2 years here in Boston). Then, this summer, we can attract that young wing with the MLE and a starting job for a contender, which is a lot more attractive, eh? And a younger, more athletic guy plays with the starters (and maybe wears down Joe Johnson, D-Wade, Kobe, et. al., or at least fouls the heck out of them and disrupts their rhythm to start the game. Ray will play in the 4th, anyway.).
Bottom line: no need to make trades just to do it, but changing the recipe with the current ingredients could add loft to the dish... Imagine Ray against 2nd units...