Want to remove @mac.com and @me.com from being associated with my Apple ID, and just use iCloud.com.

I don’t want to use my Mac.com and me.com addresses associated with my account anymore. I just want to use iCloud.com.

1) What steps do I need to take t accomplish this (if it’s at all possible) across 2 iPads, 2 macs, iPhone, Apple Watch, and 5 homepods.

2) if I remove them, what are the risks?

3) how do i know all the Apple services, purchases, and software (system and other) that I need to sign out of.

I had a Level 2 Apple tech tell me it was tricky, but possible, but I neglected to get the details.