Ruger was putting irons on some models of the 77, and international. I don't know if they still do.
I've had them put on several rifles. I use a Williams Shorty ramp with a Sourdough blade, and generally a Lyman reciever sight, though I did one Ruger 77 with a Williams Foolproof. Gun shows ar a good place to look for reciever sights, I've bought some fine old Redfield and lyman sights for pretty reasonable at gun shows. Often you have to ask if they have any parts under the table at likely looking tables. I have the front ramps screwed and sweated on, they are about bombproof.
You can use the Williams rear barrel sights also, but I like the reciever sights much better. For a scope backup, the barrel sights are OK. I've inletted under the butt pad to put the receiver sight slide in to have it with the gun at all times, it takes a Swiss Army knife or Leatherman to get the butt pad off. Takes maybe 5-10 minutes to get it out and on in case you dropped your scope and cratered it.
I agree about glass being better in general. Most of the problems people have with scopes is having too much magnufication, or leaving them at high magnification, or fitting them poorly and it takes too long to get on them and see. When properly fitted up, you throw the gun up and what you want to shoot seems to magically have a crosshair on it. The see through rings are the worst offender in that regard, the worst of both worlds.
You can get fairly tall ramps that work well with stocks intended for scopes.