You can try the Mega Update (latest version built is 4.6.9995):
https://www.preining.info/blog/2017/...tch-ssh-fonts/
Be sure to download the correct MarkX version.
The only problem I've had so far is that Nickel no longer worked. It just spun in an infinite loading loop. But KOReader and other programs work fine. I have a Kobo Aura Edition 2 (not H2O) which is Mark 6, in case anyone happens to read this knowing how to solve the problem.
Disclaimer: I own nothing in the package and did not build it. Use it at your own risk.