I'm in a similar situation. My plan was to see whether the guys in Santa Clara can do the coding -- then in phone/BT showed up on my head unit, I'd feel confident that the wiring piece could be sorted.
Euro spec wide mirrors; sport wheel + paddles; staggered sport rims with Conti ExtremeContact DW. JL Audio 600/6 + technic harness; Gladen Audio 8" Woofers + musicarnw adapters; Morel Hybrid Ovations. For sale: Msport front & rear sways, springs, & rear struts; OEM 264 staggered sport rims -- the most aggressive OEM rims for the 1 series.