...engines shouldn't leak oil in this location...
What location? Did I mention a location?

why would Rapco ... waste time designing a pump that is immune to it
In fact if you read Dan's above post they do design pumps imune to the
problem.

And you still miss the point. You can develop an oil leak and not know
it for a while... Then you are at risk flying your bird....

It seems that the solution would be to fix the real problem, the
oil leak, and simply replace the (relatively inexpensive) pump....
Well at least now you concede the necessity of having to replace the
pump - irregardless of whether I do it or a mechanic.

If you don't know how to fix the oil leak the first time... etc...
My skill is not the issue here.... you don't know what it is, it could
be better than a certified mechanics.