1 - Would be the same as if you migrated the whole of / to a new build. Pros/Cons come with it, esp the Cons as it can get buggy but works for the most part.
2 - You would be making a live thumb drive because installing as a system it would be looking for the hardware of that system at boot.
3 - My work around in the past has been to split into 2 partitions on the thumbdrive, install live "cd" or release on the first partition. Put all the data on the second partition which I mount after the live OS boots on whatever system.
This allows for the live OS to be updated w/o affecting data in the second partition. Best is you can "Z" the drive if you don't need it after the trip so your data isn't sitting around. You can also restrict movement to just your /home directory and save significant space.
As anything else there are pros and cons to this work around; but, there are ways of accomplishing what you want and relatively easily. Good luck.
my 2 bits, HIH
Fred
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