Just kidding. I've been pulled off a sandbar via my halyard and an inflatable years ago, that may be an option. But I'm inclined when aground, to first get my bow anchor into the dingy as fast as possible, row it out to deep water, set it with the windlass or lead to a winch aft, and make it as bar tight as possible. It can be lead through an aft chock too. Then try everyone on the bow to see if the keel lifts enough. Usually, alittle wave action can be used to your advantage if you have a rode pulling you toward deep water.

With a strapping son and inflatable, this should be quick. Then maybe I'd try the halyard trick, but carefully, with the engine assisting.