LisPi on Nostr: It would be difficult with the original. The eZ80 would be painfully slow but ...

It would be difficult with the original. The eZ80 would be painfully slow but feasible.

In general, I think an alternative needs to be able to run modern encryption in some way or other.

Of course some manner of "shield" or other hardware providing the feature for weaker machines is also possible, it would need to become something of an off-the-shelf component though to not fall into abusable patterns once more.