Wouldn't it be easier...
To just upgrade to a vert feed body? I have a r/h feed, and it's a real pain in the ass sometimes...I'm upgrading to a different body eventually. It's only annoying because I like the way my current cocker body is milled/anoed, but I hate having my loader high up and the elbow twisting around, so it's gonna go eventually. You can get new vert bodies from planet for like...£150ish? I'm not sure.
But as to keeping the old body, I doubt that a revy would cut it. Personally, I'd get an egg or, better still, a halo.
Hope this helps, just my 2p.
-Mike