I don't think it's going to be long enough, because there's a spacer between the prop and the bearing for an airplane engine.
This way the prop will clear carb and thottle arm. You can add a small OD washer so the washer will only press against the bearing's
inter race then add more more washers..but damn the prop is going closer to the needle valve. and the throttle linkage is going to be
a little wickage or not at 90 and 90.

Keep in mind the prop will also flex back and forth from changing rmp

You might be able to put the nut on it with a thinner prop washer...but if my life depended it..sometimes I even double nut the prop nut.
Prop have been known to fly on me during start up

Even if you can get a nut on, it'll be border line, and a spiner is out of the question.

My life is worth alot more than $60.