Compare 1996's "FITALY": "For the FITALY layout, we have obtained an average travel of 1.8, to be compared to an average travel of 3.2 for the QWERTY layout. (For prose, involving few numbers and symbols, the results are even better.)" https://www.textware.com/fitaly/fitaly.htm https://the-gadgeteer.com/1998/08/22/fitaly_review/ And closer to OP, "HexInput": "Please use this idea! If you are a software developer, I u…
There were a _lot_ of programs in this space, one of the more interesting was AlphaTap! by Network Improv: http://networkimprov.net/alphatap/light.html c.f., the research project: https://dasher.zone/docs/getting-started/how-to/ For my part, I just write text out using a Wacom stylus on my Note 10+
I kind of miss my Compaq iPaq, Danger Hiptop, Handspring Visor ... OK, one of those is not like the others, but it was ideal UX for the time.