anyone recognize this shower handle setup?

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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!