First note, I have no idea what it takes to tune a car and have no doubt this was already thought of BUT, if a 2020 ECU can be completely tuned, what's stopping anyone from swapping in a 2020 ECU and begin tuning for the compression and exhaust changes? It wouldn't be plug and play but surely it...
Dang, I found this thread a couple of days ago and its EXACTLY the combo I want, just cant pull the trigger until May or June. Hope this falls through for me, but really hope the sale works out for you!
I assume you've figured this out by now but if not, the car will be completely fine running on regular. That being said, if you're really worried about it, just add a bottle or two of octane booster and drive it man.
I was in the same boat, figured if I was gonna pick up an MKV, might as well grab the 2021 for nearly the same price as last years but, I've now changed my mind and am solely after an unlockable 2020. Preferably a Launch Edition too, might as well hold a bit more value over the next couple years.