Do your transom handles look like this?
View attachment 108685
I wonder what they were intended for in the first place?
If the handles are tight, I would try attaching a bridle type harness to those. A ski rope to the bridle. The load of a skier spread between both of the handles seems like it would work fine. I would NOT recommend pulling a tube from those.
If they seem loose and you have pretty easy access to your transom like the one shown in the photo, installing some transom eyes that bolt through the transom and use larger washers or backing plates would be pretty easy to install on either side of the motor in that splash well area.