Pressure washer motor on a mower

I'm want to replace my old B&S lawn mower motor with a Honda GCV160 that I have acquired. The Honda is from a pressure washer so I am trying to figure out what parts I will need. I know I will need a flywheel brake. Second issue is how to mount the blade. The shaft is keyed, there is no threaded hole in it. I'm thinking I can use some kind of blade adapter and drill and tap the shaft to mount the blade/adapter. Anyone know if this can work and what parts I would need? Thanks.