Don't overthink it.
My .223 bolt gun has a YHM R9 on it right now. Yes, that's a 9mm can. Yes, it's less than optimum. Yes, it still serves the purpose, though it's less than ideal in both weight and overall sound reduction.
Look at the Ecco Machine 5ti. Reasonable compromise on weight vs length and so on.
The worst-performing suppressor you can find is still a massive improvement over not having one at all. The bigger headache is length and weight, but with an 18" barrel you don't absolutely have to have the shortest/lightest for it to balance halfway decently well.
YMMV, a lot, don't buy this like it's a one and done purchase. Your collection will grow, unless you're a one-rifle man.