As you can read in my blog, the business case for my Orca was won when I told my wife I would design replacable high heel ends.
So I did
Take of the worn heel-surface with some pliers
Measure if the replacement part would fit your shoe :-)
(If not, the source is there to change)
Print the high heel stop in a shoe-matching color, put a parker through it from the wide side, sink it untill it stops, put some glu on the other side and screw it in the high heel.
Replace them when the wear reaches the screw head.