Just got home and checked this issue - the pattern is just a very slow broken double stair which should not be uncomfortable to hit, especially that it is going in one direction only. Also, regarding pitch relevancy, only the last note breaks the "rising" pattern and even then it should not be much of an issue.
Just checked again, it feels a lot more natural this way rather than going 1-2-3 since the notes before it go 6-5-4, regardless of thumb used for spacebar
Gotta disagree, the player just needs to train more hand/finger strength if this is going to be an issue