Stealth STH-3S? I mean, a Scarecrow would be perfect, but no mini exists AFAIK. Snake 2B, or the Phoenix Hawk 4L or 5L would also suit, if you don't mind the factional availability issues (battle salvage?)
One way to look at this - go to the MUL, click on the magnifying glass, pick Availability Dark Ages, and Alpha Strike property STL. Give you 66 options, then it's a case of picking one with a mini and that you like.