I picked up a Lenova tab 2 7", a 32gb micro SD card and SD adaptor this afternoon (all for just over 100 bucks aus), put the adapted SD in my 404sx, formatted it with crossed fingers, sampled a couple things, then removed the micro SD and chucked it in my tablet.
Success! I can see my roland folder, import/remove/rename etc and get my existing sample library on and off the micro by using an OTG usb drive in the lenova micro usb port, with all the samples I used to keep on my mac, sorted/foldered and ready like always, woot. (your tablet will require OTG compatibility, and you'll need to root your device to require the ability to edit files on the flash storage, but I'm happy as is.)
The fact I can prepare and sort live sets/my sample library with such a cheap off the shelf device (that I can even sit discreetly next to my SP with a setlist written up on it!) is kinda blowing my mind atm, macbook will be getting sold if I'm still this happy in a month. sorry if this is all obvious to you guys, but I'm hoping someone else finds this as handy and dope as I have.