Re: cruising dinghy in currents and beach camping
I really think you're over thinking this d. Have you got any sailing experience? If there is light wind you can usually keep going, just at 2-3 knots. It is rare that there is NO wind at all, and even if, just chill on shore till the sea breeze kicks in.
A cat can be paddled, just not efficiently or for long distances. You could certainly avoid a rock island full of seals if you had to, and with 6" draft float over a reef. If you think you can row a sailing dinghy against a current for long distances, well, I happen to think otherwise...