You are welcome. I didn't spell bluwateronly correctly, here is a link that will get you there directly
http://www.sailnet.com/forums/members/bluwateronly.html I don't recall if his is shoal draft or not. BC31s are not very common. Here is a link to how Robert Johnson bought the molds when Bombay Clipper went out of business and used them to create the first Island Packet.
Good Old Boat - Oct. 2004 Island Packet Interview It will give you some interesting background.
I may have exaggerated a little on the ten knots. But not by much. My sails were new in 2005, still in very good condition, made by Quantum and the genoa is a 150. In other words I carry a lot of sail and generally end up with the motor on in single digit winds unless, for some bizaar reason, the sea is very flat and I am on a reach. At a boat speed of 3kts or less the motor usually gets started because the ride can be very hobby horse like at such low speeds.
In re-reading your original post I would have no concerns over the strength of the boat for any normal coastal cruising circumstances you are likely to encounter including grounding.
The pointing of the boat is what it is. With the boat being so short and beamy the shrouds prevent the jib from coming inboard enough towards the centerline to get close to the wind at all. To get inside the shrouds would require a very small jib. The boat really needs all the power it can get from the front sail. A barber hauler really can't help either. The jib track is as far inboard as possible against the cabin top.
If you need to do a lot of tacking to get to open water, a BC31 will give you a lot of practice. What are you sailing now and what angle does it tack through?
Maybe SD or some of the other knowledgable folks could comment in general how a shoal keel affects upwind performance when compared to a standard keel. What does the seller say about the upwind performance of the boat you are interested in? Can you take it out with the owner and see how it performs before getting too deep into the purchase process?
Good luck and keep us updated on what you decide and why.