I think restoring a bow depends on one's intended use of the bow as well as it rarity. Bear made millions of bows (as many as 350,000 some years) and bows like a 67 KM is not a Mona Lisa. (As a matter of fact, they even restored that old lady didn't they?)
If a bow is in decent and original conditon... and can be shot, I would leave it that way.
However, if it's a rare one, but looks like someone dragged it behind a truck a few miles on a gravel road, I'm sending it to Don or Rich for a facelift.
When we Bear fans are long gone, most of our collections will be put on some classifieds and not in a museum.
Besides, Fred made the bows to shoot, and it's more fun to shoot one that looks good.