I'm using the original CPS for the "D" model but it doesn't look anything like the original CPS so I think something went wrong. Still working to get around the learning curve on writing a DMR codeplug. I have the DB25-D Pro and an Ailunce HD1, both DMR. I programmed the GMRS frequencies into the HD1 but haven't used it. I have a separate Retevis 20-watt GMRS radio in the truck.
Word of caution about using a ham radio on GMRS frequencies. Those aren't type accepted so not technically legal. I doubt anyone will care though as long as you stay within the power restrictions.