If you’re ok with some bulk, go for an nvme enclosure. I have a sabrent one with a 256 GB crucial gen 3 drive in it, it’s a slow cheap drive, still substantially better than any usb key and you can put one together for under $100 cad including a longer high speed cable.
I just did a fresh install off of my usb key and wow, super slow compared to any time I’ve done off my enclosure
Be really interested to know what it’s made out of. Had a coworker who used to work in forgings and did some stuff that got sent to nuclear plants, they said that they had really strict requirements on material compositions, specifically needed to ensure that the (think it was steel, may have been something else) material had basically no traces of cobalt in it because the cobalt would becomes radioactive over the service life.