Even if you can't boot from usb directly, I can easily make a very small "stub" iso file that you can burn to cd that will allow you to finish the boot from a usb stick. These are so easy to make, we could make them regularly if there was enough demand.
If this interests you, the next step would be to discuss how to make the live-usb. I'd recommend installing live-usb-maker from my github repo. Here are the instructions for installing it:
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sudo apt-get install git git clone https://github.com/BitJam/live-usb-maker git clone https://github.com/BitJam/cli-shell-utils