Yes, it would be possible to do the things you have suggested. It may be necessary if an older scope is being used that does not have an image moving reticle. A bridge may be a help on a heavy recoiling rifle because of it's stiffness. On a 6.5, I think the extra weight and bulk isn't justified. A scope tube is a fairly stiff beam by itself.

All my projects are approached on a case by case basis, so there's no one-size-fits-all. The modern scopes have plenty of adjustment for such a setup as in the pictures, so there's no reason to go to additional expense, weight and complication if it's not needed.