I really cannot see how you can get away with doing anything less than a full rebuild.

I mean if you are going to replace the rings, you have to remove the pistons, which means unbolting the rods from the crankshaft which means replacing the rod bearing, which means you should have the crank turned which means replacing the main bearings, which means replacing the seals...

You see where I'm going with this?

Wait for more answers, and check with a mechanic.

If you have a camera it would be great to see some pictures of what you have going on.