I now have race mode working on my RHD Uk Giulia 2.0L Petrol Veloce. As you can see above getting the trim off first time was a bit nail biting for someone not used to using trim tools and removing plastic trim hoping to put it back on. Thanks for advice above very helpful. I have used the 2017 DNAR selector I bought second hand. I also ordered the new DNAR switch from Alfa, but didn't want to risk updated part not working and not being able to find an older so bought both. The new part also worked so to confirm part numbers both (2017) p/n 156121266 and (2019) p/n 156131347 can be activated on a 2.0l RHD Petrol giulia. Here is a quick video while stationary of Race mode being activated
Race Mode Video Link.
Here are some tips from a novice to someone trying to do this. The trim is very difficult to release the first time round. I was following the Alfa Service manual and it really doesn't give you much information. I found that taking off the coin holder first (easy). I didn't bother to take off the lid or back facing rear passenger seats. Had a look but could work out how to pry. In the end not necessary in my opinion. I next loosened the storage bin sides using the thinnest trim removal tool. It will clip off a little but not come off all the way. The storage bin has large clips that stop it being lifted up easily without partially taking up the gear shift bezel trim and centre console. Start at the front at the cupholder side. On mine one of the sides had more room and was easier to take up. From there just work around with the trim tool and make enough room to be able to pull up the storage bin free. When putting back both the storage bin and centre console trim go in together pushing down the storage bin first. Once the centre console was out it was easy, just make sure you have some star bits for screwdriver. I took out the trim a second time to check second DNAR switch and it was far simpler. So will make removing for Dealer trips pretty simple. Main word of warning would be to be careful of scratching the upright sides above the centre console I have done some light stratching that I will need to try and polish out somehow. Possible protection with some tape or other would avoid this.
The MES side of it was easy if you knew what to prepare for. After changing bit 88 from AC to CC and run the proxy alignment a whole load of system unavailable messages come up (ESC, FCW, TSC, ABS, Parking brake and hill start). These disappear once the three ABS Calibrations have been executed. These are very sensitive to if done on a level surface first time I tried on what thought was a flat drive, but would not run the steering alignment calibration. Moved to somewhere else and it worked. I did also get a check engine light, which caused me to reinstall original DNA switch. This disappeared after a couple of engine restarts. I then reinstalled the DNAR switch and it didn't reoccur. I think it was probably something todo with a bit of messing about with trying to get the ABS calibration to run.
Have not had time to properly test, over next week or so will give it a go and will take to a track early September so should be able to report back then.