Yes - I fitted clubsport S / RS3 / TTS bushes and the steering feels much better than before. (Although even replacing with the same would have freshened things up). Has not affected comfort at all.
They are not quite solid rubber, but the voids are much smaller than OE.
The part number starting 5Q has been superseded and is now 81A 407 183 from VW. About £44 for both.
If the TTRS ones are solid rubber I would be tempted to use them, they will be less boneshaking than poly bushes.
I think you are local to me so could maybe meet up when the weather improves.