I think I'd rather keep stockpiling in hopes of trading the excess OFs and a C for pitching. Assuming there's actually an excess.
For now, the only way you can find out what you have in Altherr, or increase his value (which is barely better than a AAA player's value now, at best he's damaged goods, at worst, he's a bad hitter, either way he hasn't played enough) is to play him. They'll pick up another LHB to round out the OF. To me the Martinez rumor was only connected to the notion that the Phillies were gonna trade Hernandez, because then you still need an OF with Kendrick at 2B.
Ideal scenario is still that Willams can't be stopped from taking one of those jobs by late July, and that, if Altherr isn't great, Quinn is ready and healthy.