so the smallest solution would be an m.2 enclosure .....500gb for less than 150us. Somebody will release a integrated enclosure that makes use of the type c port, in an extended grip....3d printed. Drop out m.2's in their own sub-enclosure.....a kinda of magazine.
That is a very good idea and definitely possible.
https://www.amazon.com/Wavlink-Enclosure-Included-Aluminum-Support/dp/B06Y5XJG8J
https://www.amazon.com/Crucial-MX300-525GB-NAND-Internal/dp/B01L80DH4G/
$173USD for both