Correct me if I'm wrong, but to me it seems that if you want a single color frame you would stipple the frame and then Cerakote the entire frame whatever color you choose, in your case OD green. Using a black frame as an example, if you stipple it first then the entire frame would be black until you Cerakote it OD green.
If you want a two tone frame, then stipple the entire frame but have only the portion of the frame that you want OD green Cerakoted.
It seems to me that if you Cerakote the entire frame OD green and then have it stippled, you will be burning off the Cerakote which will result in a OD green frame with black handgrips. Plus doing the stippling after the frame is Cerakoted would open you up to possibly damaging the Cerakote finish that you just had applied.
If you need any examples to look at check out Danger Close Armament, they do some fantastic work.
https://dangerclosearmament.com