In case anyone is wondering. I did end up putting the Grivel Horns on the BD Shrikes. I had to cut down some of the rubber sheathing and grind off a bit of the metal on the ends, but I was able to get the horns on. I am planning on climbing on them tomorrow to see how they work. They seem pretty solid.
They worked out great! Still holding up strong with no sign of wear. It's a good cheap way to get a pair of leashless tools out of your old shrikes. They're a little heavy compared with the newer tools, but if you need a cheap way to get out onto the ice, I recommend it.