SRAM road is very incompatible with Shimano/Microshift.

Just get a 10 speed SRAM road RD. They aren't hard to source. QBP (the largest US parts distributor to independent bike shops) has Apex, Force, and Red in stock, as do Amazon and other consumer facing vendors. If you're in a pinch you can also use a 10 speed SRAM MTB derailleur or an 11 speed Road derailleur, which all share the same cable pull ratio, although doing so would be far from ideal.