I sent my SME 3009 S2 (Non-Improved) off to “Robert Graetke”, at Analog Tube Audio. The Website is http://www.analogtubeaudio.de
I had it rebuilt and rewired with his silver wire, which I believe you could possibly purchase from him separately?
I cannot comment on the sound changes as, I unfortunately never got my TD-124 back together and running….
Eliminating the original SME connector block and getting an RCA or 5 pin Conversion kit, is a good option to take.
Verses running litz or other wiring, all the way to the pre-amplifier. Which I feel, would lock you in to whatever sound that cable provides.
On doing the tonearm wiring yourself…take a look at this site and see what is involved with the re-wire SME 3009 first: https://audiokarma.org/forums/index.php?threads/sme-3009-series-ii-tonearm-rewire-tutorial.989728/