Converting sram 2x to 1x derailleur help

I’ve been thinking of converting my norco gravel bike from 2x to 1x on a budget.
It’s a 10 speed with sram red shifters (road). I’d be using my existing crank but going to use a 40t narrow wide ring and an 11-36 cassette. Buying a new chain as I’ll probably need a longer one. I’ve got a short cage derailleur on it now so I’ll swap it out to something with a clutch.
I was looking at the sram gx 2.1 but it’s listed as a 2x derailleur.
Is there anything out there that will work for this setup (pull ratio etc)?