Canjar is gone, but sometimes the single set version for the no.1 shows up second hand, gunshows, or interent sites. It has a trigger shoe with a little tab that goes forward during the setting of the trigger. Can be used as a conventional or set trigger.
Kleppinger is an Austrian single set type trigger that is available from Brownells, and other spots. The appearance is different from the oem trigger. Fairly pricey, but nice.
In some set triggers one has to get used to trigger movement after release.
The Moyers is kinda a replacement type of conventional trigger that minics the old original 3 screw Ruger No.1 trigger(has sear engagement screw). Appearance is similar but not same as the oem Ruger two screw or three screw trigger system. About 50 bucks per. Some like them, some don't.
Some people use the oem 2 screw trigger as is for appearance sake; however some gunsmith's drill the hammer for a stud near the sear surface engagment, to space off the hammer/sear fit ie for a lighter trigger pull. The hammer is hard and needs carbide tooling for the hole, ..........as in most things, lots of care(common sense) is needed for how much to offset. I prefer that to some gunsmiths grinding of the engagement on the hammer. The oem hammer is a factory fit part only.
Finally there are some gunsmiths that make their own version of trigger for the No.1, most are in short supply and usually fairly $.
Finally, I have seen a trigger shoe do some good for some triggers, at least in the psyche. Larger surface area gives the feel of a lighter pull.
I bet that 22lr No.1 is fun to shoot; not many do that type of thing.