My goal is kinda what you mentioned, what you would like to avoid!
My issues were if i know one addon, or something will break with the next release, i have to stay on current release with everithing...
Also e..g. I only can direct to an .exe file as "the default browser" in windows, not to a shortcut.
But I just tested it
(forgot the keyword from the previous tip (thanks localization...), so i installed as default, not standalone, my bad, but does not matter), and it works basicly like what i wanted to reach, excellent tip! I have created 2 extra profiles, but if a program opened the browser, it defaulted to the default profile. To avoid the "one exe" problem, i just install an other backup as mentioned previously. All decided on the shortcuts anyways!
Thank you for the excellent solution!