Learn blind typing with 10 fingers, if you were not doing that yet.
Not only will it be a timesaver for the rest of your life, but it allows you to get into flow much easier, where your thoughts stream effortlessly to the screen.
And if you thinking about re-learning how to type anyway, try doing it on an optimised but common layout like Colemak or Dvorak. Basically no extra cost, but even greater savings!
I continue to be skeptical that there's any substantial performance improvement. The published research is obviously ambivalent-at-best. And my anecdotal life experience also make the Dvorak typists look pretty mediocre (including the ones who've been doing it for a decade).
On the other hand, a very real cost is that if you want to pair, or receive coaching from a mentor, or coach someone, or just let a significant other type a quick email on your laptop, that works poorly. Though you could view that as a perk, I suppose. Also keybindings optimized for physical layout on QWERTY will no longer apply to you, which can be inconvenient.
I'm sure that depends on how you define "performance" -- for me, the greatest benefit is in hand comfort, not speed.
Switching between Qwerty and Colemak for any of the reasons you mention has never been a problem for me either. Obviously, going from Colemak to Qwerty is going to be inconvenient for the sole reason that Qwerty is inconvenient, but that's only because you become aware of how much you contort your fingers unnecessarily once you've been typing for a while not doing that.
I agree keybindings can be an issue, though. For me, personally, it's minor compared to everything else, though.
Not only will it be a timesaver for the rest of your life, but it allows you to get into flow much easier, where your thoughts stream effortlessly to the screen.