Pointing on brickwork unfinished

I had some dummy builders who did not do the pointing on a section of brickwork. They left the mortar flush with the brick. The pointing has to be half round -or "bucket handle keyed"-. They are not coming back and now the mortar is hard.
I have tried the Dremel rotating tools, with a round profile, but even the ones made of Tungsten Carbide wear out quickly.
Does anybody know of a tool/technique to shape the mortar to give the proper pointing finish when it is already hard?
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The very best solution would remove about 3/4" of the mortar, reapply, and restrike the fresh mortar. This is called tuck pointing.
This can go faster using an offset grinder with a diamond wheel or a tuck point grinder. Here is an example: http://fastenmsc.stores.yahoo.net/botu5tugr17.html http://fastenmsc.stores.yahoo.net/diamonds.html
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