Could backfire, of course. She could throw you in a cage for even bringing it up. Not that it’d matter, of course; you’ve planned around the possibility of getting caged thanks to all the loyal storm beasts in on your plan. Maybe if that happens, you could let the King do his Spaceballs routine on the princesses, let him betray her, then swoop on in and get her help in fighting him? Maybe even get some Elemental help on account of “enemy of my enemy is my friend”?