The problem is the NTFS part... I have a few more modern laptops that won't boot on a NTFS partition because it is not FAT and the BIOS / UEFI doesn't support it. You might be surprised who is capable and who isn't
That's why something like this needs to be investigated very well, and tested on different platforms before we can actually do something. Again, the idea I like very much, I kind of played with the same idea a couple of months ago but ran into some issues with flashdrives that support multiple partitions and flashdrives who don't...
We will discuss this and try to find a solution but in the meantime, if you have an example of solutions that can actually do the above, I'm very happy to hear about it