Lisa Ann, Kayla Kayden, Jynx Maze (retired imo), Keisha Grey (she did an anal scene recently for Jules Jordan and shot for Brazzers), Kagney Linn Karter, Emily Willis, Adriana Chechik (but doubt she is shooting anymore, just like Emily), Kristina Rose, Carter Cruise, Remy LaCroix ++++ (i think some of them are semi active but probably $$$). Not sure if you are planning on getting them out of their onlyfans retirement since you mention Riley Reid. But should I add Tori Black (one can dream?) or Nikki Benz?
If none of these are possible, I think it should be easier to get Jazlyn Ray, Charly Summer, Casey Calvert and Emma Hix since they are still officially active and not onlyfans limited..
But any of them doing anal please, since most of them are anal specialists and did hundreds of anal scenes on 2D.
