Started a new job where I ended up having to switch to qwerty for pairing sessions, typing like I was using a computer keyboard for the first time, never mind interviews where one might need to live code on a foreign machine. Having to explain "oh hai, yeah I actually use a different keyboard layout because my fingers move less but it hamstrings me whenever I sit at _anyone elses_ keyboard" just doesn't cut it. If you've got issues that'd be helped by better typing ergonomics and really need to switch then go for it.
Otherwise, don't waste your time, just get better at typing qwerty, trust me.