C/B in a shallow mooring
Hello, I will gives some thoughts, based on my experience with an O'Day 23. I am by no means an expert.
I think the tide itself will be a pretty gentle landing. I have anchored in shallow water in Florida that at low tide has set my boat down softly, even all the way on her side with no damage. (you may get some sand in the keel slot that will stick the C/B in the up position - but it tends to rinse out as soon as the boat gets moving.)
What I would be most concerned about is how protected the area was from wind that could cause waves. Once I was sailing another O'Day 23 through a shallow pass with the C/B raised and I was doing o.k. with about 6" of water under the keel. But then I ran into some waves with short chop that caused the boat to pitch alot or "hobbie horse". The front of the keel hit bottom fairly hard. When I was able to inspect later, it actually put a small crack in the hull right above the keel. (this was on an early O'Day 23 with an iron keel that bolted into a recess on the hull bottom) the later boats with glassed over lead keels might fare better)
In short, unless your area stays smooth as a farm pond, if it were me, I would look for someplace different. Good luck.