I can't help with the plate, but it does sound like something Remington would do to reinforce the stock. I have an LSS (5 years old) in 7mm, and put a Limbsaver pad on that works great (#10112). Mine original pad was glued on so bad I wound up taking it to a smith, and he soaked it in solvent for a day. The Limbsaver pad has a plastic base, so I imagine you could just grind out a small section to match the protruding plate.
If you like your hunting rifle, you can keep your hunting rifle.