In for info.
just starting down the 9mm pcc path and would love a can (would be my first) that would work on 9 and .22lr
While you could get a can that did both 9 and 22, I would buy a dedicated 22s and then do pistol calibers with something else.
The 22 cans are generally made so that they are easier to clean, because 22 cans get probably 10x dirtier than center-fire cans do.
Also, 22 cans are direct thread since 22's are a fixed barrel gun 99.99999% of the time. Swapping the piston needed for locked-breach actions (usually) on and off to go between the two will be a pain, but you have to do it since shooting a fixed barrel with the piston on the can will eventually trash your threading.
And I don't even want to talk about forgetting to take the 22 end cap off when you shoot your 9mm...
I would definitely split these two apart and get a dedicated 22 can, and then one for 9mm and above. Maybe one of the multi-part cans in 9mm or 45 that could pretty much handle all your centerfire (pistol and some rifle probably) needs.