I have a 2.5 Merc 4 stroke, it's 30 lbs... was thinking of exactly same thing as back up, bracket for attachment would work fine,, not so sure tho the length of the prop shaft will drop far enough into the drink to offer much help.... guess I have not measured waterline level off the swing platform either... with that said, assuming the platform is near enough to the water line to work, I'd suggest a "teather" line from engine,, in case while trying to lock it on the bracket it falls off.. would suck watching your $1000 kicker sink to the bottom of the drink...