Offshore in a 23.5?
... It been suggested that any off shore sailing a fellow should consider having a backup rudder on board. I opted to get one. IdaSailer recommended installing a bracket right beside the existing hitch for the rudder. That way in an emergency I can just drop in the spare without having to waste time removing the damaged rudder...
Chiriqui, while I'm a great believer in redundant safety systems, I think a spare rudder is a little overkill on a 23.5. Speaking from our experience, we have little enough room down below as it is. A big rudder lying around somewhere is the last thing we need.
All the additional hardware you are contemplating, plus extension of the outboard bracket, seems like a lot of work for our little boat, and -- worse yet -- it would clutter up the look of that lovely sugar-scoop transom. If you want to carry that large, heavy original rudder down below for that 1 in 10,000 chance you'll lose or damage your rudder (I presume you are using your original rudder for the backup?), that's one thing, but I don't think I'd take on the alteration to your transom you are contemplating. Plus, if the emergency arises, you are probably already in fairly rough conditions. It would be a beast to wrestle the original rudder into place in rough seas. Or do you have a lighter weight backup? I think this system needs more contemplation before doing anything.
More fundamentally, I suggest a water-ballasted, 24' sailboat really isn't the best choice for offshore sailing. In
Grasshopper, we don't enjoy 20+ kt winds or seas over 3', which would easily be found offshore. We cruise happily in the more protected grounds of LI Sound or Lake Champlain, where such conditions are fairly rare & it's easier to run for shore if they do. I guess you could have some marvelous passages sailing offshore in Panama, but I think I'd find cruising grounds in bays closer to shore or stay within 5-10 NM or so of shore.
My 2 cents.