Buy a 64gb deck and replace the SSD in it.

Don’t think about what will you do with the 64gb mmc. That is the future’s problem.

Keep it around and use it if you need to RMA. You can find M.2 NVME enclosures on Amazon- I personally recommend the ones from Orico, though I don’t think they make enclosures specifically for for 2230s (but the enclosures have screw pegs for fitting them) so 40% of it will just be empty space.

Lick it like a Switch cart.

Honest answer. Get a small USB C enclosure and sticky tape it to the back so you have more space.

1. RMA
2. Troubleshooting
3. Sell it
4. Enclosure
5. Buy a 64gb SD and upgrade it to 256GB.

Put it in an enclosure.

But you should definitely keep it in case you ever need to send it back.