Turn upwind 50m or so from the beach, remove the daggerboards and raise the rudders. Uncleat all the sheets, release the downhaul. Then go stand at the extreme bow of one hull. If you have a crew get him/her on the other bow. With the transoms out of the water, the bows way down and nothing to trip the boat over you're going to glide down straight backward onto the beach.
This method will work with any cat, in any condition as long as you can get the transoms out of the water. I've used it in
Santa Cruz to get back to the beach in a swell with a hobie 16, surfing backward, I used it in
Bandol where the harbour is narrow, long and right in the Mistral axis with a Hobie 14 and 18, and I used it two days ago to get back ashore with my Stealth at
Datchet.
Make sure you are really upwind of the place you want to go to, because with this method you don't control where you are going, the wind is... Also, if you are alone, you need to figure a way to make your wheels accessible in the front of the boat. A Datchet I leave them on the pontoon, but you can also leave them anchored for easy access.