Hi, I just bought a 2022 gt and am really glad I came across this thread. I too have the need to move the bars back a little.
After exhaustive phone calls to triumph techs, I found a mechanic that could finally answer my question about the cables (wiring) being long enough. He said I should be able to get 2-3 inches. I also contacted triumph to see if there were wiring extentions available, but no dice. If the rox risers dont bring the bars back enough to suit me, I was thinking of making my own extentions. I hate to tear into a new bike but I'm a harley guy and like leaning back when I ride. If I can match the connectors I will make my own. Of coarse I will wait till spring because I am in Ma. and it's kinda cold to be riding. I will post my results. I might even give it a shot sooner. I will let you all know if it works out. If it does I will make a few sets and offer them to you fellow gt riders.