I actually have one of them pill cutters, but as yet I've had little luck with it. Could be that Aspirin is trickier to chop than your run-of-the-mill Arimidex tablet, though.
Another thing I'm wondering about is the fact that nolva will lower serum concentrations (or whatever) of Arimidex. Would this not tend to warrant a slightly higher intake than 0.25?