Can you help me with a solution for our boat to wakeboard?

You don't have to have a tower to wake board. We pull people with our 26' Express Cruiser's ski hook on the transom. It works, just you won't get as much "Air". Try that first and see how you like wake boarding before you drop money on a Tower. To make the wake as big as possible on a light boat, have everybody sit as close as possible to the stern. We have Tourney wake boarding boats with our friends, but the wake the Express Cruiser throws is incredible! Also, you may want to try Wake Surfing. It's way more fun and no rope to worry about.