The RCRs front plane is higher than the front plane of the RMR. I'd say however, that anything that's g2g with the HD is also g2g with the RCR.
Trijicon Suppressor sights should be more than good to go, or a set of Ameriglo GL-429s. You can get the the Trijicons with tritium that has black rings around the vials. I don't see an issue with tritium BUIS unless you're gonna be passively aiming the pistol under NVGs, in which case the tritium blooms and messes with acquiring your dot.
On my Staccato, my RCR is like a lower 1/8th co-witness- so as you can see, that higher front plane is definitely something to consider.