[S90 - 2017] Getting Drive Mode on-screen select to work without the selector switch

[pjmq]

Im in a similar position - s90 without the button.  I tried many combinations without success (i mainly want the polestar gear shift mapping, as i already have polestar tume from dealer).  

 Ive purchased a button panel to retrofit - but uncertain if it will be plug and play or require some wiring mods due to the rear seat climate control buttons.  Ill post back if i get around to installing

I'm *really* trying to avoid putting in the hardware to support this, it looks like a pain in the ass to do. 

Cars with the polestar pack fitted aftermarket seem to have the drive options *without* needing the drive selector toggle hardware so I'm presuming it *can* be done. Just need to figure out how.