Thanks guys, some good feedback on here. I don't want to bore out the tool post as I like to keep things original or at least able to return to original and that would be past the point of no return.
I like the idea of trying to find or possibly make a top slide. I think that it will come off when you feed it in all the way but not sure. The Z plate/adapter, if I am understanding the idea, would likely not work. With the post sticking up off the top of the tool slide, I can't see how I could put this on and not either be way too far back, way too far forward or too far on either side of the slide.
Does anyone know if there are slides that are mountable/universal? I was just thinking that with the tool slide off, I could put a different universal slide on it and mount the grinder to that.