No you just (by constitution) have to swear allegiance to the crown to become a lawmaker, which makes you a perjurer if you don't acknowledge their power.
Also is the monarch not commander in chief their armed forces? I thought being under the command of the queen / monarch was part of their oath. If your soldiers are sworn to do what the queen says that seems like a lot of potential power.
Yeah, it's crazy to me that the UK has no armed forces, the military are all personally bound to the monarch. The king has interfered in politics too, so arguments based on royalty not being active are off to a bad start.