So, thanks to a post from a person I learned to trust in this forum I realized that I was making a fuss about nothing and thus I decided to try pkgbase on my second laptop, not my main one, using pkgbasify.lua .
It worked absolutely FLAWLESSLY. I created a new BE before launching it but it was not necessary as the utility prompts you to create one.
It's also very fast, my laptop is 15 years old and it supports only NG wifi and despite that I had the system up&running in less than two minutes. Impressing indeed.
Of course it will require a lot of testing before I switch on my main laptop but everything is running at least as before.
Only nitpick: at the first reboot lightdm did not honor the autologin configuration and asked for my password. After removing all .pkgbase files, loader.hint and a second reboot all was as before.
Just my 2cents.