well, in all honesty, stainless is much harder to fix compared to Aluminum or Bronze. Requires special procedures for welding, whereas the other two are relatively easy and soft to work with. This goes with "wrecking lower units" if you hit something with an aluminum or bronze prop, the prop will absorb more of the impact vs transmitting it to the lower unit, and wrecking the internals. As for corrosion resistance, Aluminum and Bronze are further over on the galvanic scale than Stainless, so, instead of the prop being sacrificial, now your aluminum lower casting is...... a little science goes a long way, and with corrosion, good anodes go a good bit further.....
as for this prop, the design of it is what is going to make it non economically repairable. I can guarantee that your local prop shop wouldnt touch it with a 10 foot pole. You cant just bang this thing back into shape with a 24oz framing hammer and call it "good enough" like has been done for years with standard designs....