Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
since you brought up grinding as an option... just grind off the tops of the bosses and fill with brazing material or even epoxy, then grind or sand again and repaint. or heat them up and pull them off, then fill.
but if it were me, i would choose your third option. leave 'em on.
put on water bottle cages and use them. or like me just don't put on the cages at all. you know, there are very, very few people that will EVER notice, or care to notice, that they were not original on that frame, including all of my biking friends and acquaintances that i now or will have, if not yours.