Hi all, further update from me and info for anyone who may be researching this recall.
So, my car ended up going in to get this software update. Once that was carried out it produced the gearbox error (Auxilary pump error in scan). The dealer rang me and informed me that they will re-book the car to get it repaired in the week after. Prior to this, the car had 0 symptoms of issues and I never used Start-Stop (I suspect it doesn't matter).
I got the car back with the error and they informed me I could drive for the meantime. I could instantly notice the new software behaviour (very eager to get into high gears when cruising and felt very boring as others have described). I just let the car sit till I had to bring it back in for repairs as I didn't want to risk it.
Fast forward to the day I dropped the car to get the gearbox repaired, I fortunately had a loaner so not a big hassle to me and it was covered without question, which was my biggest concern from the start. Took a few weeks and received the car back where they informed me the pump bolts were loose and didn't drop out, so they used the repair kit (with the pump and hardware). It drove the same after I picked it up and seemed all good.
Unfortunately, as soon as I got home, I noticed some fluid dripping between the trans and engine after shutting the car off. I did a few trips to confirm this, and it was leaking droplets every time. So, I rang them and had the car booked immediately. Fast forward a week or two, they ended up replacing the clutch pack cover / plate. I was quite paranoid and began monitoring for leaks even after and it looks like the cover has done the trick.
Since then car seems to drive as it was before all this. I do notice some clunking on downshift from 2nd to 1st (when stopping) but think this may be normal behaviour and probably don't want to overthink it as I'm tired of this recall. I had only owned the car for a few months prior, so it was quite stressful when I discovered mine had this outstanding.
Good luck to anyone. I would say definitely do it as long as it's covered.