Prince William has reportedly taken King Charles III’s “slimmed-down monarchy” initiative to the extreme. But as the next king readies to slim down the Crown even more than his dad, a “severe warning” has been issued by some royal analysts when it comes to trying to alter the foundations of the monarchy. “The simple truth is that the royal family cannot be whittled down to a precious few without the risk of having it grind to a halt altogether,” author Christopher Andersen told an outlet. “If either of them starts to wobble, the whole thing can come crashing down,” he added. “At the moment, Ka…