anyone recognize this shower handle setup?

Name:  IMG_0507.jpg
Views: 134
Size:  52.3 KBName:  IMG_0508.jpg
Views: 216
Size:  33.9 KBName:  IMG_0509.jpg
Views: 244
Size:  37.3 KBName:  IMG_0510.jpg
Views: 132
Size:  40.2 KBName:  IMG_0511.jpg
Views: 121
Size:  52.7 KB

handles have a male brass hexagonal adapter glued in (7/16" across) - attaches by setscrew to a chrome adapter screwed to a roughly 3" plastic threaded extension nipple which screws into the valve body and connects to the cartridge. no access to the valve body without demoing finished surfaces, so I'm hoping to just replace handles (or trim & handles). no brand name that I've found ...

thanks!