What would the cheapest hardware wallet look like for Grin?

There are a bunch of options on the market that are 50$ or more and I was wondering if someone built Grin specific hardware wallet, could the cost be much less?

Which microcontroller would be a good choice for this and how would your ideal Grin wallet look like?

P.S. No, I’m not building one, it’s just a question that popped in my mind and I’m wondering if it’s possible to bring it down to 10$ + some software installation.

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Maybe a starting point would be an arduino, someone built a hardware-wallet for bitcoin out of it: https://www.youtube.com/watch?v=nGyGdnQ0nhU (with explanation)
You can get arduino clones with same chipset for < 2 $ (check ATMEGA328P on Aliexpress or Ebay (https://www.ebay.de/itm/Entwicklungsboard-AtMega-328P-CH340G-Uno-R3-kompatibler-mit-Arduino/174256063680?hash=item28927884c0:m:mTuniDgbXZXfoNQ0NcyidRw)