I'm not saying that's not a thing, but if you're going to switch keyboard layout I do think that's objectively the least of your problems. Re-learning a huge list of common letter pairs, triples, etc. that appear in words in English / your native language(s) is a bigger task.

To make a hyperbolic comparison: seems a little like saying that learning cyrillic letters is a problem for learning Russian: true, but compared to learning the rest of the Russian language...