My suggestions:
- steering wheel audio controls and probably bluetooth
Forget it, this might either require replace whole steering clock spring or replace harness only plus steering wheel. Because the steering remote and airbag connect to the clock spring then back to normal wire.
For bluetooth connectivity just find and replace the radio to aftermarket bluetooth supported one.
- mirror adjustments, autofold will be a added bonus.
Maybe can ask them help swap to executive version parts into it. Forget autofold as the other version of saga don't have mirror folding mechanism, unless you know how to DIY and make it work.
- front 2 speakers on driver and passenger door
Can, replace headunit then add front speaker by pulling a new wire from headunit. Stock headunit possible but to get the terminal that fits the harness is a great pain.
By the way, except autofold problem, you can actually get the problem solved by getting higher spec saga and is much more worth

damn hahaha. Guess have to wait till warranty finish then go change those parts.
cause this sv is my daily workhorse, but I end up spending most of my time with this car huhu.