Looking for holster makers that are known / have already done leather holsters for RDS (In my case, a Springfield XDM 3.8 that was milled for Deltapoint Pro 7.5 MOA.
I've done that as well. Crowd sourcing an answer never hurts in case I missed someone good. I have emails out to Ryan Grizzle, Del Fatti, Wright, and Sparks as those are people I've used in the past.You may have to take the initiative and contact a few holster makers yourself and ask them that same question.
Try James Nelson at Nelsonholsters.com
Site sponsor and makes some great holsters. Can never hurt to ask.