All right, all right. This data visualization is totally flawed and I post it only as a reminder to make a better version based on the original concept.
So as a logical layout design freak my first suggestion would be to ditch the two-finger hunt-and-peck approach as the basis of the cost/score calculation and implement an acceptable evaluation model.
Other than that, comparing a multitude of languages may be interesting (I always focused on a single language or rather a combination of languages).
All in all, QWERTY seems to fit the needs of Czech hunt-and-peckers the best, but the heatmaps clearly demonstrate how much potential layout optimization has.
Sadek Baroudi released his VIK standard, which is a set of specifications and guidelines for interfacing between printed circuit boards, e.g. a main keyboard PCB and a module that supports specific features.