I meant to add something potentially important to the story of getting people towed off the sand beach in post #41 - that other experienced mariners that post on here (e.g. Squire, Sharphooks, BC Coast Pilot, Flashman, Loghauler, Gong Show and all the many others) and SAR specialists would likely agree with and have already thought of - the NUMBER 1 rule of assisting in any capacity for any marine incident is:
Don't get yourself into the same spot/risk/tragedy as the original vessel you are trying to assist.
So with that declaration in mind - there are some things to think of and do when assisting in such a situation...
1/ Be prepared with a long enuff tow rope (likely 100 feet or so) and maybe even rig up a bridle on both ends
2/ have good communications with the original boat operator and an assistant to handle the lines
3/ describe the plan and the risks to everyone beforehand and during the operations, and finally
4/ mitigate every risk you can think of until everyone is in a safe place
What I did in this particular situation (and these suggestions may be of assistance to any mariners and/or sportfishing-wannabees reading this post in the future) is to:
Get ready on the incoming tide before the boat starts to float and be prepped for the time on the higher tide when the beached boat should float by:
1/ Standing by close - but not getting too far into the beach and having the same thing happen (getting taken ashore by the surf)
2/ Standing by in water deep enuff to keep the leg down and not slamming the bottom in the surf, and pointed out into the surf so you have power and control
3/ using the wind/surf to take the end of the tow line into the grounded boat where someone in waist-deep water could retrieve that end. Don't get too close into the beach handing over the line. Poly floats - nylon does not. A float/bumper on the end of the rope may help. If the boat is ashore - it is easy access to the strongpoint/eye on the bow that trailered boats have can be used for towing. Those easy on/off carabiner-type clips/shackles are useful here. On the towboat end - a side line off the other stern cleat can make a bridle when attached to the tow rope on the opposite stern cleat and be adjusted in length to keep the tow pull strait and centered and keep the lines off the outboards.
4/ Once hooked up - keep a light pull on the beached boat until it starts to float - then give it. Getting the bow out into the waves and the beached boat sliding along the beach until it is deep enuff for them to drop the outboards/legs and start-up is crucial. Less weight (passengers out) until any heavy boat is at least turned into the waves is often helpful to get the boat turned if you are already towing hard and nothing is happening. If it instead a small, light boat - they might be able to do turn the bow out while they are on the beach beforehand using their legs and pushing on their bow by leaning their back/butts into the hull at the bow. This will all take communication, co-ordination & timing.
5/ Both boats need to be in a safer spot before the rope is disconnected. Again, this will take communication with the beached boat operator before and during the operation. The tow rope can get caught in their props if the operator guns their boat rather than letting the tow boat keep pressure on the line by pulling. Disconnecting can be dangerous for them with getting someone out on their bow, and it takes a few minutes to demobilize everything. Meanwhile both boats are drifting. The best option is to tow everyone still connected out into safe water - deeper and no surf - like around a corner or into an adjacent cove before letting go. Again - this takes communication & co-ordination.
Anyways - I hope these experiences and suggestions help someone sometime in the future.