Those spindles are done. The bearings inner race is a precision fit to the spindle. If you had to grind on it, even just with a Dremel, then it isn't a precision fit anymore. If the bearing has any slop between it and the spindle, it will wear out the spindle even more as you drive it.
At this point, I would say that the best you could do would be to patch it up with new bearings and drive it backroads home. I don't think I'd be inclined to keep driving it with those spindles for any amount of time/distance after that.
