1. If I can carry a laptop somewhere, I likely don't ever need to borrow someone else's computer there. (Today with pocket-sized bluetooth keyboards and your average phone, this seems even easier to do.)

2. If I can't bring a laptop, but I'm allowed to RDP, I can often RDP into my own machines. Your machine still uses the keyboard layout you tell it to, so even if you are working on a QWERTY host machine you might still be typing Colemak to your own machine.

3. If I need to help someone else on their computer, it is often better for teaching/learning to let them do it themselves and just direct/supervise.

4. In the worst case, even in modern times, a surprising number of people hunt-and-peck on keyboards. The only person that feels embarrassed about me hunt-and-pecking on someone's QWERTY keyboard is me, most other people don't even notice (it is still that common). Even if I can't touch type in QWERTY any more, I can still do everything I need to accomplish on other people's machines with hunt-and-peck, and that's fine. I just had to give myself permission to feel embarrassed about that.

(4) is definitely the hardest. It's also not as necessary for some people as it was for me. Colemak was designed for, and some people are quite good at, being able to use it side-by-side QWERTY and keeping touch typing skills in both. If you use physically different keyboards for the two, your muscle memory can use context clues to use the right touch typing in the right place. In my case my QWERTY touch typing form was bad and unlearning it was also part of the reason for switching to Colemak and after I switched it was never worth learning "proper" QWERTY touch typing and I have long since lost any embarrassment I had at hunt-and-pecking on other people's QWERTY keyboards.