Launch by yourself? Absolutely.
Launch from the beach? Is there any other way? Beach dolly (fluffy tires) is ideal; if I remember correctly one can drag it without wheels but two is ideal to drag (if moving without wheels).
Ocean worthy? Practically speaking, no. You want flat-ish sea state and winds 10-15kts, generally protected waters. Not something to
cruise up/down the coast with.
2-up sailing: if your wife weighs same/less than you no problem, except that
learning to coordinate movement will result in going swimming routinely until you sort things out.
His/her
boats would be fun (I was in a club where we each took our own out). If you go the sunfish
route it's simple to learn which lends to easier to get hooked. This coupled with the cramped
cockpit can result in a "why don't we just get another one" discussion. People practically give these
boats away so it doesn't require any big investment and, importantly, there's so little to possible 'upgrade' that you won't find yourself later having dumped any extra money into it (people tend to try to dump money into whatever they buy; I think a beach cat is horrible in that regard insofar as there are so many doodads available for cats).