Putting it on a rarely used key is a decent idea, but the thing is that you'll still need to press it from time to time, and it'll still feel weird when you do. Possibly more so since it'll feel like an unexpected surprise each time.
Since it feels very different to press, consider putting it on a key that is very different. So, not something that's part of a normal workflow (like ESC, or even a rarely used key like ~ ), but something that you only press in unusual circumstances, or that does a very specific, unique function. For example PrintScrn, or Numlock. That way, the unusual sensation won't feel so out of place, because the key functionality itself is unusual. When you think about it, why does something like numlock feel exactly the same to press as every other key? Wouldn't it actually make more sense for it to have a click-in/click-out toggle feel? Or at least a stiffer spring so it's harder to press than the other keys?
I've ordered a cool looking artisan recently myself. It looks smooth, but it's flat, cubic and narrower than a normal key, so I'm sure I'd hate to press it as part of regular typing. So I plan on using it for a special macro key that I've recently mapped. I made a little program for myself that automatically calculates math from a selection. So, I can type something like 3*21.05+99.9, select it, press the key, and it will 'automagically' replace the selection with the answer: 163.05. This key seems perfect for an artisan to me: it's special, I'm likely to only press it 'mindfully' (rather than in the semi-conscious flurry of regular typing/computing that most other keys are), I'll never need to double-tap it, and I definitely don't want to hit it by accident.
Perhaps you have a similar key in your life (eg. maybe you only ever use F11 or INS to do something special and important in some program, like "render" or "go fullscreen"). Something that you do as a culmination or an adjunct to your work or play, rather than as part of your normal flow (hence there'll be no flow to be interrupted by the weird keycap texture)