Mostly if you're not smart enough to work remotely in which case you're probably not the person to be trying to bypass a PAL in the first place. And again they're not designed to trigger the bomb incorrectly if messed with because the whole point is to make them unusable unless you have the PAL code.
One might easily imagine an energetic disabling event that doesn't result in nuclear yield. Just fire one detonator.
That said, Command Disable mechanisms on modern weapons don't result in a loud bang. However, there's no guarantee those mechanisms are all that are used in mechanisms which may deter physical penetration of vital areas of the weapon.
It's easy to imagine but also it makes these immensely more dangerous to house and transport. Why fail dangerous when scrambling the timing information is as effective at preventing a nuke from being used?