I used something similar (a third party protocol converter thingy) to plug a non-GM CD changer (a 6 disk unit, I think) into a 1998 GMC Suburban which only supported the GM/Delco expensive/sucky changer.

Worked fine, although doing anything behind a dashboard is a pain in the a$$.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8