Very interesting! I'm in the same position having almost given up on finding index 11s. Had seen comments previously saying index 12 in an N53 is a bad idea but maybe it's worth it then seeing as it's impossible to source any 11s.
I can't say anything for protool as I've never gone that route but I'd strongly recommend getting a cheap OBD cable and getting ISTA/INPA. Personally, I've only used INPA as bimmerprofs is full of helpful guides, all be it with some questionable English at times. It's amazing the detail you can go to with it, I can see all the adaptions for the injectors. With that, I am thinking I might be able to get away with just replacing one bank with 11s/12s and putting all the supposedly good ones in the other bank till my wallet is looking healthy again.
With regards to coding/re-adaptation, it should be a breeze if you are technically inclined. I'd look at [
https://bimmerprofs.com/injectors-adaptations-coding/] for some insight on the current injectors and possibly [
https://bimmerprofs.com/not-encode-injectors/] for some help on coding although I haven't looked at that properly I'm sure there are loads of guides out there.
With regards to re-adaptations, this guide is all you need [
https://bimmerprofs.com/re-adaptation-engine/]
I got all the tools from [
https://www.bimmergeeks.net/downloads] and [
https://bimmerprofs.com/msd80-loader-2-023/] update package as well.
Hope that helps and I haven't hijacked the thread too much but I'm glad the index 12s could give me hope!! Reply or DM if you need help, I should probably get back to work for now!