I have a solution, I call it:
"The Rowboat"
Where's my golden Nobel-Neate Forum Peace Prize?
Not only do you get the luxury of easy control solo, but you can also accomodate 4 people standing up. The concept the OP fails to understand is that the problems solo sloopers have is having to do wheel, anchor, cannons and sails - you can't remove those and if you make the ship any smaller you will literally be captaining a rubber dinghy (or, as I point out here, a rowboat!), that or you remove the ability to anchor, steer, cannon and move (brave perhaps but... ill-conceived).