The M1A/M14 front sights won't work. The M14 dovetail is considerably smaller. I don't know that the Sig front sight device would work without some fitting. Those screws lock into a notch machined into the dovetail IIRC.
If someone has access to a milling machine and a MIG welder it should be workable. Machine the gas block flat. Machine a piece of rail stock to size. It'll be shallower than usual, the gas block is pretty high as is. Now the welding worries me a little in that there isn't much room for fudge factor; wreck the temper of the steel, deform the part, getting it lined up properly, cleaning it up so it doesn't look like butt when you're done, etc.