OP, CentOS and CentOS Steam are two *very* different beasts, you don’t want Stream.
I wouldn’t go for CentOS either because you’ll have to replace it anyway.
I’m mentioning that because you can download the old CentOS, but like the commenter above me said, you can do Alma or Rocky.
I would go for Debian, but that’s a personal preference.
Why QAZ? Aren’t your brain looks for those keys on the left side?
I always found the idea of small keyboards peculiar; I always wanted MORE keys. Could you explain the idea?