[LargoLasskhyfv]

1.) Use https://en.wikipedia.org/wiki/Zram

2.) Setup your logging accordingly

3.) Let this setup write what changed only once per hour, or a few times per day to solid storage.

4.) If that doesn't suit your needs and you can live with only 4GB RAM, get one of the about a hand full to a dozen boards which do have M.2/MiniPCIE from other vendors, and maybe enjoy faster crypto.

5.) If 4. applies, still do 1!

6.) Wonder why it lasts so long a few years later with a grin.

7.) Alternatively hot-glue/duct-tape an USB-Keychain to a free USB-Port, and still do 1.

Seriously, use ZRAM!