I would like to point that the Spanish ex-monarch practically _betrayed_ Spain to the Saudis (he's currently self-exiled there) and he still has a non-negligible amount of support in the population.

I find "support of a monarchy" an indefensible position. Bonus points if your only argument is "well the current monarch is kind of nice and therefore we're not in a hurry to remove him" because that's literally one rotten apple away of exploding in your face (see Spain) and by then it's likely too late.