Nas Cycling - Hi, I made a compatibility chart for a 2x10 mullet drivetrain. If you're looking to repurpose your old Shimano 10 speed road shifters for gravel riding, this might help
LTWOO 2x11 3x11 Speed Left Right Bike Shifter Set Compatible for Shimano SRAM | eBay
microSHIFT SL-M11-R Right Thumb Shifter MTB 1×11 Speed Shimano Compatible | eBay
Shimano Drivetrain: Cross-Generation, Same # of Speeds Compatibility - Weight Weenies
CX – Compatible with Shimano Road Derailleurs – Gevenalle
microSHIFT Right Thumb Shifter 12-Speed Mountain, Shimano Compatible - The BackCountry
Can I mix shifter (deore m4100 10 speed) with my Rear Derailleur (deore m6000)? - Bicycles Stack Exchange
Shimano 10-speed compatibility
cues | Compatibility | si.shimano.com
Nas Cycling - Hi, Here's the list of all compatible shifters & RD combo for dropbar wide range (40t to 52t) gearing setup. This is base on the compatibility chart and known
microSHIFT Right Bar End Shifter 12-Speed Mountain Shimano Compatible – The Bike Hub
Shimano Sora SL-R3000 Double 2x Left Flat Bar Road Shifter only compat