Im just asking purely out of curiosity. My train of thought is that im sure someone has attempted it. In a few years time when E39s are really old and scarce...im sure someone will attempt all kinds of weird and wonderful experiments like they do on older cars these days.
Im still looking for an E39 at this stage, found one for R35k but its a code 3. 2001 325i A/T with rear blind, navi, sunroof, and a few other features.