But on to the actual question: Is there a switch that behaves just like (or almost like) the blue switch, but requires more force to press down?
Yes, there is!
It's the green MX switch which should be found under the spacebar.
And are there any keyboards equipped with this imaginary switch?
Technically, well ... you can find
one of them for the spacebar.
I'm currently waiting for a reference to arrive, so I can't tell this absolutely for sure, but from what I saw, the only difference between green and blue MX is the spring. If you get a hundred springs used in MX linear modules (I'm still waiting to confirm this, but from pictures of dissembled MX modules, I'm quite sure), you could swap them. I'll certainly do.
(I actually have come across three model M's now, for a sum that translates to roughly $4 per board, so I'm going to try those out to see if they could be what I'm looking for. I'll get them later this week hopefully. Also first forum post, hi everyone.)
Model Ms are absolutely great. You might also like Alps switches, but depending on your location, they're a bit hard to find. Clicky Alps are, at least from my experience (and others seem to share this), somewhere between blue MX and buckling springs, so if BS are too hard or too clicky for you, this might be an option.
-huha