Is your rifle a safe queen that you want to keep around in pristine condition for collector value, or is it a tool that you intend to shoot and enjoy? If you want it to be a shooter, you should tailor it to your needs. I wouldn't hesitate to drill that beautiful American walnut for a sling stud. It is a mod that doesn't take a thing away from the rifle's beauty, and makes it more functional to you. If you don't trust your own hands, take it to a gunsmith and he will do it really cheap. Most wouldn't charge you more than $15 for something like that.
All you have to drill is the buttstock. For the front swivel, you can get a ring mount that clamps to the magazine tube. Uncle Mike's makes them. They have bigger ones for the center fire lever guns, and smaller ones for .22s. That's the one you want.
If you don't want to drill it at all, your only option is one of those strap-on velcro side sling mounts, like what the military uses to convert M14s and M16s to side swivels for a tactical carry sling. IMO it wouldn't look right for the classic looks of a Golden Boy, but whatever floats your boat.