Oh I see what you want to do. I think.
So just to be clear, you are looking for a HUB adapter that converts other suppressors so that they can utilize the Crux PMS brake?
I'm not sure if one currently exists. It doesn't seem like CRUX was ever really one of the suppressor companies targeted in the HUB revolution mania.
Here are some options:
1. Get one made by a custom machine shop. Not sure how much this would cost. Maybe even ECCO Machine would do this.
2. Send the can to ECCO machine and have HUB threads installed on your Crux, and convert to another mounting system (whether this is worth it or not on that particular can is another question itself)
3. Do nothing, have some rifles that will only use the Crux suppressors and use different suppressors on the other rifles.