As everyone has already said, nasal bioavailability of benzodiazepines is really bad. Doing anything other than eating them is a waste of your time.
Also, the amount of binders will vary depending on the drug and manufacturer.
You can easily find out the exact amount of filler in a specific pill by weighing a pill on a milligram scale, some of which are widely available online for a very affordable price. The cheap models aren't great for weighing out quantities below 15mg, but they will definitely weigh something as heavy as a pill. (Even a pill with 125 micrograms of active ingredient may weigh as much as 100 mg.)