How is it fair that someone who (wisely) doesn't IV ends up with ampules of morphine?
Anyways, OP, very smart decision on not using via IV. I agree with Mr.Scag, I'd just plug it or snort the liquid. I think you can lay the solution out on a saucer or something and the liquid will eventually evaporate off. I'm not sure about benzos but putting morphine in the microwave will result in destroying some of the active ingredient so it is not reccommended. Another ROA for the midazolam (and possibly morphine, I'm not sure) could be sublingually and/or bucally - you can squirt some of the liquid under your tongue and hold it there. I've also heard of wetting a small cotton ball with the solution and holding it under your tongue or between your gum and cheek.
I would probably opt for rectal administration if you're comfortable with it. It significantly raises the BA as opposed to oral or intranasal.
HOWEVER. I would strongly discourage the use of these substances together unless you are extremely experienced and know your tolerance to these substances very well. Even then it's not a great idea as the use of an opioid and a benzo together greatly increases your risk of overdose. Also keep in mind that midazolam is used in surgery due to it's ability to cause anterograde amnesia, and opioids are added to this to increase that effect. Aka, you can easily black out and have no recollection of what happened when you sober up.
Please be careful and enjoy responsibly