Why not set up the new forestock for shooting and do cosmetic repair on the old one, for display?

Looks like you still have the old threaded rods. Easy way to reinstall them is to drill out the holes just enough for a slip fit, coat with viscous glue (epoxy works), and push into the holes they came from, paying attention to align contour on the ends. Looks fine from the outside and holds as well or better.
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