If you decide to use your leaf blower and cant find a way to attach a hose, you can still cut the nozzle so it is not so long, and then get some air conditioning duct nice black rubber gasket material and tape the edge of the blower so it doesnt scratch anything if you touch the car, and it will be just fine...
I modded a toro electric blower like that geez, almost 10 years ago and it still works great.
And I can tell you, unless you stick the vacuum end of the blower in a pile of rocks and turn it on, it is Never going to suck something up and blow it on the car..
You will have it in your hands, way off the ground, away from anything...
Good luck with this !
Dan F