Well, from doing a little research I've seen a few studies that cite oral bioavailability of midazolam to be about ~27-35% due to extensive first-pass metabolism.
Intranasal routes have about a ~75%+ bioavailability.
Good work! Okay, this has been answered I think midazolam is one of the few water-soluble benzos.. all the rest, definitely a waste insufflating. Crush and snort sounds like all the prep you'd need, can't think of anything else. Remember there will be a load of inactive crap in there too that you will be putting into your sinuses (as with snorting any pill). Also, with a much higher bioavailability, adjust your dose accordingly.
Closed as answered but pm me if you have any queries