Well for our Mariner 4hp which is saved for river use and only sees action once a year I have a bag like this... Outboard Covers & Accessories - Portable Outboard Carry Bag
. Not that brand but one in thick vinyl which gives great protection when it's stored in the garage and carried in the car. It's a proper snug fit to the outboard and makes a neat package.
Of course with the Honda being a 4-stroke you have to ensure it is stored the correct way.
Other than something like a bag in the locker you are back to a bracket... is there nowhere to site one?
Oh yes and I have seen someone with blocks mounted on the floor that locate a small outboard then it's secured by a strap over each end.