I built my own trim wheel using a 10-turn-potentiometer and a Joy-It zero delay encoder. The picture below is the prototype in use. It is attached sideways to the Logitech throttle quadrant (same form and size)
The wheel input is assigned to the trim axis. It is a joy to trim the aircraft with the wheel. I can fly now with much more precision during all flight phases. Especially reaching a stabilized landing configuration is much easier.
As noted by others before, it may conflict with autopilot usage. But as I mainly fly GA aircraft and the taildraggers for bush flying, I never use the autopilot. Whenever I fly other types and use autopilot or FMC I disconnect the trim wheel and use the elec trim buttons on the yoke.