Hope your skates aren't suede! Suede is easily messed up.
Riedell sells
polish for skates. But I believe the directions said to prep the surface first, and use a "leather preparer". That might mean removing the current clear coat (which boot makers have said varies in composition by brand), and roughing up the surface to make the new polish adhere. It is also possible that prepping the surface is overkill, unless you are very picky about the finish.
And it is also possible that new Riedell boot polish only adheres to Riedell brand old polish and/or clear coat, and wouldn't work on some other skates. I haven't personally tried it. The tech at a pro shop in Ithaca, NY (at The Rink) said it worked well on several brands. (Caution: that was a fair number of years back.)
If you want the new color to last, you might add another clear coat layer on top. Don't know whether that is needed. Something like an art supply store acrylic? Of course, the boot might not breathe well.
But if ordinary thin boot covers add too much weight
(huh???) wouldn't an extra layer of polish do the same? Unless it is the appearance of boot covers that somehow makes you feel heavy, not the covers themselves.
Is Beige now passé everywhere in synchro, or is that a local phenomena?