First off...don't you mean "Super Dimension CAVALRY"...? "Calvary" has quite a different meaning, especially when combined with "Cross"...
Second...I really doubt it. Back in the day, I had model kits of Jeanne, Lana, Charles (or was it Aderzej...?), the hoverbike, Seifreit's Bioroid, and some aquatic guy who never actually showed up in the show...from the booklet that came with one of the models, it seemed like the merchandizing push was less aimed towards the mecha and more to the armor, and I don't think a Spartas toy or model was ever produced (except for the crappy Robotech one which could only transform from tank to gerwalk). If Southern Cross, for whatever reason, gained a new surge in popularity, we might see the old models making a comeback (a la Mospeada, or the Bandai Macross reissues), but there STILL wouldn't be any Spartas. And even that kind of popularity seems unlikely, let alone any increase big enough to warrant making brand new toys.
Yamato (or whoever) couldn't even really go for the nostalgia crowd, since it's predicated on the "Hey, I remember that!" factor...but no one watched the show in the first place, so who would remember it?
Your best hope would be Toynami, but I think it's still a VERY long shot. A kind email letting them know of your interest certainly couldn't hurt, though.