People make this argument a lot, but you should optimize for the most common situation before an edge case. I am usually at my own PC/keyboard and I greatly enjoy my weird keyboard and layout. I can't type qwerty as well as I used to, but I rarely have to. (If I had to do it more I'd probably retrain it to make switching back and forth less troublesome).

It reminds me also of people who swear by using default settings in their editor or other programs so they can feel at home anywhere. Yeah, that's sort of a benefit, but I don't think it outweighs optimizing your workflow at your own machine.

I had a friend who used a split keyboard, blank keycaps, and a very odd layout (QGMLWB or BEAKL2 I think) at work. IIRC he said he kept a second normal keyboard at his desk for when someone would come by to pair program. This is sorta the inverse of your scenario. I guess he'd need to carry his keyboard to someone else's desk, or just type slower.

The only time I have to use QWERTY is the occasional touch screen kiosk or something. And you're not exactly touch typing an essay in that scenario.

Back in the in-person days when sharing a keyboard with a coworker was more common, you have the very handy switcher icon in the taskbar.