Get a Rev6.
Holtites are a press-fit, so assuming they fit correctly into a Rev4 Planck, you'll run into problems due to residue left behind on the holes. It'll be a mess of work desoldering, cleaning, pressing, and then you can no longer use those switches you removed if you decide you want them in the keyboard again.
Easily avoidable headaches aside, Holtites are a not even worth looking at now that sockets that were actually designed to accept keyboard switches (with 10x+ the rated cycle life) are on the market for about 1/15 of the price.