My hack was to combine a Hoodman loupe/cage with a used 1950s pistol grip.
It lets me hold the camera lefthanded and take care of aperture, exposure, shutter with the right. The Hoodman caged the DP screen, and its diopter let me shoot without glasses (and without screen glare). I know you’re a GR guy, too, and this hack works well on the GR too if you want to bring it to your eye or are being infuriated and frustrated by glare.
Even a pistol grip on its own—the kind camera stores have in their Nobody Wants This Crap bins—is worth a try, unless you’re enslaved to Franiec
. In which case start offering bribes in the Want to Buy section.
The DPQ series offered a Sigma branded screen cage/hood. I use that on my DP2Q (which has its own battery-holder grip on the right). Good luck.