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Hi Steve, my name is ***** ***** I will be helping you today.
The outboards propeller does use a sacrificial rubber hub. It is supposed to let go and sacrifice itself in the event of a hit. Sometimes though, especially with stainless steel props, that doesn't always happen and shafts do break.
You said you broke a shaft. Did you actually remove the lower unit and confirm a broken drive shaft? Or is that just an assumption because there is no thrust?
Impacts seldom effect the actual engine itself. If something happened to the engine that would show up as either broken crankshaft or bent connecting rods. Both of which are easy enough to check for.
I want to check and see if there are any aftermarket lower units available for this engine. Do you have the actual engine model number handy?
Are you still with me?