I've used Uncle Mike's chest rigs for scoped hunting revolvers for a long time, well over a decade some of them. (For use after bagging game or traversing difficult terrain, etc.) I forget the number of the holster, will have to dig some out. There's at least two different lengths that have been produced. Quite handy, and able to be worn in a variety of ways.

ETA: They might be a tad large for your reddot, but it's easy enough to either sew it up some with a heavy gage needle and thread or poke some holes in it and use some black nylon tie wraps, etc. to remove excess slack. The deer won't care what it looks like.