Hi @Webclan, this basically works for me if a colony is unworkable.
What I do is grab another bottom box & half fill it with frames of brood from placid hives & fill the rest with frames of drawn comb… Smoke the cranky hive well, then remove the honey super without taking the lid off, gently place it down a few meters from the original site… Then take the brood box several meters away, & replace it with the 2nd brood box you prepared earlier. Replace the QX & honey super… After a period of time, most of the field & guard bees would have left the cranky brood box & returned to the original site, leaving mainly young & nurse bees. It will be a 100% easier to inspect the frames to look for the queen… Even if some bees out of the brood start to attack you, you can walk away & they will eventually return to the old site, leaving you free to continue inspecting frames. Admittedly with this strategy you’re basically doing a split. You buy a new queen to replace the cranky queen at the same time the bees in the 2nd brood box (the bulk of the colony minus the nurse bees) start making a new queen… It would be good if there was a lot of hatching bees in the brood you add.
PS, getting back to your problem of finding the queen: If your queen is unmarked, it does take a bit of practice to locate the queen. You can do a few things to help. Make sure all of your brood frames are nicely drawn, straight & mostly worker comb. What I do sometimes is hold the frame on a 45deg angle to look for the queen, sometimes they stand out by doing that.
I helped some people find a queen the other day, after inspecting every frame of a 27 frame colony, the queen was on the last frame. Anyway the lady had the apparatus to mark the queen, which she did. I don’t think there is any shame in marking a queen. @Valli has her queens marked.