Its a tricky one, but if Saints could get a deal done for him to drop his wages and perhaps on a play as you pay deal, so could offload him with little hassle if it didn't work out... then you never know, it could be a bargain.
I get what people say about Beattie being a big character, but I think Adkins could handle him and could bring the best out of him if he gets him fit and part of the team ethic. For my part, having met Beatts a few times, I thought he was a good lad and as he's no doubt matured a lot since leaving Saints, I doubt he'd be that big a problem off the field (lets face it, even some of our current squad arn't exactly angels).
Beattie has done some charity events in and around Soton, even after he left the club. His missus is a local girl, I wouldn't be surprised if he still owned a gaff down here.