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What exactly are you trying to achieve by replacing the stock TPS? Since you said S4, I'm going assume you have the stock S4 TPS & throttle body which lacks a "full range" TPS sensor (i.e., it doesn't measure throttle position from fully closed to WOT), and you need a "full range" TPS for your stand alone ECU?
IF that's the case, you can probably find a used S5 throttle body and S5 TPS sensor and swap in the necessary parts. In addition to having the same partial range TPS sensor as the S4, the S5 TPS adds a 2nd full range TPS sensor to the TPS assembly to support the electronic OMP. Just use that one to support your ECU.
As you probably know, all the FC's used a linear potentiometer (variable resistor) as its TPS. The 3rd gen (and just about everything else these days) use rotary potentiometers that rotate directly with the throttle shaft or thru some sort of geared arrangement. Adapting one of those to work with an FC throttle body would take some serious fabrication effort.
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