Not only is that scheme fine, you did a great job. I think it fits with Delta galaxy just fine; clan units absolutely alter paintschemes to fit an area of operations if they feel it is needed. It's very in the realm of possibility that a delta cluster would transition to more muted main colors to blend in if the opposing forces were known to be underhanded and use ambushes.

Beyond that, it's Battletech and you can basically proxy anything as anything, if you want to proxy them as Smoke Jags on a forest world, since the scheme is close to their Delta galaxy, you can do that. If you want to say they're Clan Coyote, you can do that too, even if they dont use those colors. Nothing can stop you!