The 60% water is enough to fuck the solubility entirely. Don't bother with "normal" vodka etc, it doesn't work well.
Use glycerine if you are scared of PG, I bet it should work equally well. But propylene glycol isn't regarded as being majorly ototoxic (to my knowledge) nor should you be dosing etizolam by dropping it in your/other's ears (save that for Macbeth re-enactments), so that should be fine.
Something like peanut oil, sunflower oil, any other light flavorless cooking oil should dissolve etiz too, with gentle heat.
In a real pinch you can use undenatured 99% isopropanol, just make sure you keep it so you don't ingest more than ~1mL. Acetone might work too - there was a paper on using acetone for Salvia divinorum tinctures, and it has way higher solubility for stuff and yet is tolerable on the tox scale (little more toxic than ethanol, but that's easily offset by the fact you take way less of it).
