Double-Alpha responded to my plea and recommended three of their holsters. I'll share what they sent below for anyone else looking for a holster. They're all race-holsters which seems to be only option aside from leather hunting holsters. I'll probably start with them.
Something like the...
Can anyone recommend a holder for competing in ICORE or USPSA with this revolver? For a gun labeled "competitor" it's a surprisingly difficult gun to compete with.