Put in a double battery, and wire in 2 auto bilge pumps. OR... get rid of the carbon seals, and install regular stuffing boxes. (seal and bearing pack) The down side to those is they can fail in a BIG way. Basicly, if you lose the rear seal, and the bearing rusts, and seizes... it will spin with the driveshaft, rip the boot... and leave a big 1-1/2" hole in the back of the boat. In turn... sinking the boat in about 20 seconds. This is exactly why Seadoo went to the carbon seal. They leak... but it's controllable. AND... it's virtually impossible for them to fail catastrophicly.
These boats simply weren't meant to be used this way. Think... Big jetski... not fishing boat.
Don't get me wrong... if you are camping, and want to leave it in overnight... just check on it every few hrs. But don't plan on leaving it at your local marina.