According to the ruling which says it does not target, you can and must destroy 1 monster that fits the condition. If there are several monsters with the same Level, and you remove from play that Level number of monsters, then at resolution you will destroy 1 of those monsters. If a card effect is chained to alter the number of those monsters, well, no problem. You destroy 1 of the remaining monsters.
Short answer, mikoal, yes. See Fissure for similar interactions there.
The card wording "Remove from play any number of..." implies you pick a number. You don't target those removed monsters, because it's a cost. You don't target a specific monster either, and remove from play its Level number of monsters. You just pick one arbitrary number.
Having said that, you're not allowed to activate a card that will have no effect, so the numbers you can arbitrarily pick are restricted by what's on the field. It doesn't target anything, though.