As already discused, its just mater of some time when the brain will adapt. And it will. 
I went through right handed stick during my training in Zlin226 to left handed stick in Zlin142 and then to left handed yoke in Cesnas. There was definitly some geting used to, especialy with the Cesna as the yoke travel is not realy that precise imo as normal stick, but all worked out wel. And it will do also for you I am sure.
The DIY extension for WH is not a big deal especialy if you dont plan to use the butons as you mentioned. You can check this Snark’s thread where you can find some useful details about his project