Stupid boat/hose clamp question

Getting a few more things "done" on boat. Spent more than enough $$ on track mount and rod holders, so getting the track spots picked out. Short piece measured out and mounted. Only mounted middle 4 screws for now. I may decide to slide track back so didnt want to drill end holes yet and end up with end holes exposed. Added a piece of marine varathane piece of plywood and metal straps for support. I'll make the decision where to add the next track after taking the boat out.
Replaced triangular plywood platform at bow where trolling motor mounts. Old platform was shot. Added a thin aluminum plate for support there as well.
Looking at something to hook up for tubing etc to drag grandkids around.
Something out there called Turboswing but pricey as hell for what it is. Almost $1000 Canadian.
Was hoping to get something safe that wouldnt break the bank. I figure just clip to the cleats at either side of the stern.
@dadsbee got any suggestions?
Hope to get wet tomorrow!
XXL TurboSwing Ski Tow Bar

20210517_203713.jpg

20210517_203826.jpg

20210515_204557.jpg

20210517_204613.jpg

20210517_204621.jpg

20210517_204606.jpg