Buy a second Tele-Rollei with the knob version that you like. But it, swap the knobs, and sell the second one?
Those knobs are standard across Rolleis. Well, except for the back locking system, a tab that is pressed by the back when closed and tops you from pulling the knob out. There are a few different styles over the years, so study the details. Then send some photos out to people like Harry Fleenor and Jimmy Koh to see what they have to offer.
Oh, installation- three small screws like you see on the bottom spool. Lift and lock the knob for easier access to the screws for installation.
The Rolleikin knob has a leather disk. Remove that and you will see three holes that match the standard knob. Unscrew, lift off, drop the replacement knob in and screw down.