I seem to be one of the rare people who has no problem running the Windows desktop with HDR on all the time, and I prefer the sim with HDR over without. I have a relatively modest setup (DisplayHDR 400 branded) but it gives noticeably brighter highlights and richer bright colors versus flying with HDR disabled.
To simplify sharing screenshots, I wrote a program that does a similar HDR->SDR conversion to what MSFS itself is doing when you’re flying with HDR off; the parameters are tunable if you don’t like my defaults. 
It’s a command-line program with a wrapper batch file; the program watches the current directory for .jxr files as saved by the NVIDIA overlay utility and converts them to SDR .jpg.
I’m hoping to eventually add fancier HDR processing effects and other postprocessing like a sharpen filter, but I have no fixed schedule. 