Continued....
Simplifying appeals to me.
Try to stop using your macOS user login accounts and Home Folder names to identify your computers. I think that will help you the most. Maybe think about it this way. Lets say you have multiple file cabinets in your office (represents each computer). You label one file cabinet as "Personal", and another as "Work", and perhaps another one as "Charities". And each file cabinet has a full drawer assigned to you (bob) and another one for your wife (mary).
While macOS by default will assign the computer name by using part of your user account name along side the basic model of the device, this is not required.....You can manually edit the computer name to whatever you wish and it is much simpler than changing the user account name & Home Folder names. Within macOS you can customize the computer name so it would show as "MBPro 2022", or "LivingRoom-Mac", etc. :
Change your computer’s name or local hostname on Mac - Apple Support
Think about the form which macOS presents to you when creating a new user account. It asks for your first & last name. While you can fill it out with whatever you want, it should have a name associated with you (real name, nick name, avatar name). Or if you wish to separate work & personal accounts on a single computer, then perhaps you would name them "bob-work" and "bob-personal" (only the hyphen is allowed as a special character in the short user names).
When repurposing older systems for other uses:
Plus when you repurpose those older systems, it would be a good idea to perform a clean install of macOS & set them up again as "new" if they will be used for other things....with 2018+ models, you can easily perform an "Erase All Contents & Settings" so only macOS itself remains as if you had just performed a clean install.... you are presented with a Setup Assistant for configuring the Mac again as if "new".
I guess you could just create a new admin user account, then delete the old user accounts if you still want to retain all of the existing software, but this may not be quite as good with the M-series Macs with their new concept of ownership (first user account created is considered the "owner"....it really is not clear how the "owner" concept really works, but it has been known to cause issues when trying to update/upgrade macOS on an M-series Mac).
Edit: Here is @Ziatron's other post which inspired this new post about macOS user account/Home Folder names as they were encountering issues migrating to new systems & updating old devices:
Dropbox, need advice when I get a new Mac. - Apple Community