While the interior is partially disassembled, I need to replace the piece that the shift lock release tool hooks into, the existing one broke off at some point prior in its life.

Is this a replaceable part? I skimmed the @ECSTuning catalog & didn't see anything for it.

I think it's #10 - Emergency Release on this site
https://www.realoem.com/bmw/enUS/sho...diagId=25_0448

 

Hello,

https://www.ecstuning.com/b-genuine-...e/25167577719/

Its right here and replaceable

Sorry for the delay I was out of office.

 

Ordered, thanks @ECSTuning

Any advice/guidance on how to reinstall this part? The one that was 'in' the car when I got it, was in 2 pieces in the floorboard.

 

Yep, that might be a pain where it is or it might be easy, never messed with that part, i know once you have the console out you should be able to get to it.

Worst case you have to drop the exhaust and heat shield to get access to the bottom of the shifter box.

https://www.ecstuning.com/b-genuine-...c/25167644233/

 

I've already got the center console removed, but haven't really taken the time to look at how it might install.
Really hope this doesn't need to be installed from below, looking at that image, I'd doubt it & looks to be all accessible from inside.

 

Replaced.
had to stare at it for a while to figure out where it went & another few minutes to get it routed in the right place.
Center console finally back together, but broke the trim ring around the shifter boot