There's a bit of misinformation floating around that I will try to clear up. Firstly, is that the medium frame hammers and triggers are fully interchangeable with the large frame parts. Secondly, your Ruger already has a freespin pawl in it. The difference is that it has that little plunger that engages the ratchet teeth on the cylinder to line up the chambers at the audible "click". If you want it to freespin in both directions, all you have to do is remove the plunger.
IMHO, both the half cock conversion parts and the freespin pawl are two different solutions to the same problem (chambers not lining up with the loading port) and there is no reason to use them in conjunction. Since your sixgun does not exhibit that 37yr old issue with the loading port, there's not really any reason whatsoever to do either modification. Unless you just want a half cock notch. Sounds to me like all you need is an action job, will usually costs about half what those conversion parts will and the result will be better anyway.
Try a new, reduced power trigger spring first. With the "Poorboy's trigger job", you can feel the leg of the spring rubbing against the hammer spring. Springs are cheap, get a new one.