Eh, I add in one of the magicka regen mods, too, and just cast levitate :V
Though more than that, from what I recall the racer removal stuff doesn't remove the plumes, just stops the critters themselves from spawning. You can still buy the things, and I'm pretty sure there's at least one alchy shop that does the whole infinite supply thing, if for some reason you need hundreds and hundreds of levitate potions.
And checking the wiki, the answer is not just "at least one", but instead seven different ones, one of which has a restocking supply can be stolen from a chest, meaning you can get functionally infinite amount of plumes while paying absolutely nothing
and not having to deal with the screeching annoyances.
You may want the plumes, but you don't need the beasts themselves

... also, the other levitation potion ingredients are all cheaper to buy. So not only are plumes the worst ingredient, cost wise, for the potion, they're also attached to one of the most annoying creatures in the game. You can get rid of the cliff racers.