What I used for a J frame was a Lee case trimmer cutting head and a Lee case trimming pilot modified for length & diameter.
The store bought K,L, & N frame trimmer has a pilot 0.310 in in diameter, my J frame tool has a 0.214 in pilot diameter. 0.215 would probably be more in line with factory spec. I expect I turned it down from a pilot for .22 center fire cases.
There's no makers name on the store bought tool, but an old Brownells catalog shows Power Custom as the maker. You might contact Power/Grand Masters LLC direct and see if they've got any. Brownells may have dropped the item due to lack of demand.