This provoked me to realize what is missing from throttle feel, namely inertia of linkage and throttle bodies. I added mass to free end of throttle pedal, for a subtle improvement.
OK, adding inertia was enough so that G29 throttle feel at least no longer distracts me,Its actually NOT inertia, its friction.
Many of the cheaper ones only have a life of under 100,000 cycles which I calculated wouldn't last that long. There are plenty around with long life but many are over £100. However I found a good range from Variohm Here for reasonable money. I bought mine from RS Components and went for a 50mm long version.
I used linear bearings to make a sliding carriage that would operate the transducer. As the linear transducer is quite delicate I wanted to ensure it didn't get any side loads.