I'm all for it, and have been advocating for it for a couple of years now.
An all ages .22 category using two .22 single action pistols, any lever action .22 rifle, and a 20 gauge or better single shot (or single loaded double/repeater) shotgun.
There are plenty of folks out there with a single action .22 revolver and a single action .22 lever rifle already that would like to play Cowboy Action but don't want to borrow gear (being dependent on the good will of others) or buy gear (buying 4 new guns).
If we had an all ages .22 category, even as a side match, people could dip their toes in the game and drum up some more participation.
Sure, many of us can reload .38 cheaper than we can buy .22; but LOTS of people interested in trying out CAS don't reload, and some of them aren't interested in reloading.
Sure, you can buy cheap used guns from people on this forum, but you have to know about this forum and be willing to deal with the particulars of buying a gun from some random person you met on the internet.
You can walk into Bass Pro and buy two Heritage .22 pistols, a Stoeger coach gun, and a Rossi Rio Bravo for under $1,000 and still have money to go to Tractor Supply for a shirt, some boots, and a hat. And tons of people already have some (or some variation) of those guns (like Dad's Single Six and Marlin 39a) and wouldn't only have to supplement their current armory.