My guess is it's possible to build one on the new larger caliber frame. There would be room for the longer cartridge, but the smaller case head could be a problem. I know that Jaro designed it around a .45acp with the idea of also running a .40 S&W model. The hiccup would be if the ejector could work with a case even smaller than .40 S&W.
My personal guess is that Grand Power would have to have built and sold a heck of a lot of the .40 S&W's before they would think about adding a varient in another case size.