personally, i don't think there's a 8-speaker BOSE system in the Mazda3. It's not available anywhere in the world and not even in Japan as an option. The BOSE is meant to be with a 12-speaker set up.
so, i'd press "doubt" on the SA however if given what the SA said is going to be true then Bermaz is really mutilating the bastardizing the entire Mazda3-BOSE collaboration experience. it's sad but i feel even more sad for those who are going to spent around RM160k for a car that has been stripped.
then again, the MS version is not made by Mazda Japan, it's "modified" here locally. Mazda Japan has nothing to do with the MS version.
the chrome finishing was deleted because of complains that there were peeling off prematurely, not so much of a "cost-cutting" measurement. it's either quality issue or user-problem (eg: pressing with the finger nails, oily fingers etc.) but i would place my best on the latter.

my 2019 had no such problems until the day i sold it off in 2024 but yes, you can replace them back to its chrome counterpart but it's going to be the entire bottom assembly, the buttons are not separate. it is also going to be very expensive.
my advise, don't fix what is not broken. if you have local people tinker with a CBU car then chances are something may not fit right after that and you could very well end up with scratches, panel gaps or worst, rattles.
in any event, the black buttons are much cooler - it is also consistent with all the newer Mazda models.

For the chrome part, try search FB - Preferred Wheels. Believe they cn restore this back as new