Well, sure. I don't consider IPA toxic (look up the toxicity! It might surprise you. It's certainly no more toxic than 1,4-BD,which people are plenty happy to drink, but be scared of IPA, which I find rather puzzling), not in small amounts like <1mL, especially where the alternative might be dosing highly potent benzos without a scale, which is a horrific alternative! I won't mention it again.
Definitely use propylene glycol where available. Food artificial flavouring and colouring can use propylene glycol as a base, there might be some you can use as a solvent for benzos. Otherwise, you can probably order it over the internet without too much trouble.