Eh, if you vote Republican, complain about things getting worse, then vote Democrat, that's changing your mind. If I saw someone with that sticker, I'd assume they regret the decision and won't be getting another one. Being able to change your opinion with new information really shouldn't be discouraged.
donnachaidh
Not quite what you're asking for, but Dalinor in The Way of Kings is at the very least distruted by his peers and hated/feared by the non-Alethi. He's not hated by most of the other main characters though, so not quite a loner that everyone hates. We don't really know why at first, but it ends up being for quite a good reason, and definitely leads to drama and conflict, as well as character development.
You could do that at the firmware level, with QMK or ZMK macros (or, presumably, whatever other firmware). It might be a long one, but launching an application or the like could just be typing the combination that runs it. I haven't used KDE, but something like super, then type the name, then enter, should work.
Having said that, a quick look at keyd proposed by the other replier does seem like it has more than enough capability, and if you have one setup you want to use it for and not move the keyboard between computers, it very well might be the better choice for you.
Just imagine being that pilot. I'm sure they'll get quite the ribbing from their mates.
I haven't used tomb and I don't think I really have a usecase for this, but I respect the on-brand command aliases.