Correct, a complete change would be time consuming and near impossible as there are numerous locations that would need to be addressed. I think there have been a few that attempted it but I never remember seeing anyone who was successful. LED conversion would make the most sense, but you can't get LED versions of some of the required bulbs so you'd have to reinvent the wheel so to speak.
I had this exact same concern and with an older Alpine unit, I had my choice of four colors - blue, green, red, amber. The amber was pretty close but too orange. I upgraded to a newer Alpine and found they now only offered Blue but I've grown to be OK with it.
- Darryl