Thanks all -
I had an idea last night and tried it and it actually worked. I was rooting through one of my tool drawers and found a common carbide wood router bit that had a chip so was just dumped. Since it is only a two flute cutter, figured that it had to work and it did. That was a .25 bit and since the aluminum didn't do any more damage, I then tried a well used .75 and that worked even better. Then a good 1.0 was tried and that works best of all.
What I found was that the .25 dug in very easily leaving what looks like chatter marks, with the 1.0 making a nice smooth even surface.
From what I can see is that these router bits don't wear quickly, can leave an acceptable surface, are cheaper then the regular burs, have many profiles, and can be found in almost any local hardware or big box store. My guess is that they could be used with a router table as well if you were slow and c-a-r-e-f-u-l and used a .500 shank cutter. One reason for their survival appears that the die grinder runs at about 12,000+/- rpm while my big Porter Cable plunge router turns at 27,500+/- and they remain fairly cool.
It turned out to be an interesting experiment - that worked