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It's as simple as adding a single boot parameter to grub

https://askubuntu.com/questions/829917/can-i-boot-a-live-usb...

That's different than what the GP said.

I'm pretty sure you can't boot into an Ubuntu live disk, detach the usb, and keep using the system without any errors or loss of functionality.

That was what I thought too, thanks to abdullahkhalids for linking to the askubuntu thread that shows — with the right boot flag — you actually can https://news.ycombinator.com/item?id=25172520

Yes, in fact it's pretty easy. You just add the right arguments to GRUB, though I don't remember them off-hand.

I used to have a flash drive with GRUB installed, and several "Live CD" ISOs. It would have two options per ISO: the second would copy the squashfs to a ramdisk before boot.

Tinycore is especially great when you don't have USB3 available, because you don't have to wait minutes for >1GB of data to be copied to RAM.

toram is the parameter to add to the GRUB kernel directive.