Yes, I've done this before, of course. Adding some water to make the solution less syrupy helps, and works fine. I don't think there's any problem with this because pharm. IV benzo preparations employ propylene glycol as the solvent (like IV diazepam, for example).
I've also used 91% isopropyl alcohol as the solvent, and then added some water to it afterwards. That was shooting zaleplon (Sonata). That seems to be fine too as long as you're not using more than, say, 1ml of iPrOH and DON'T MISS! (talk about painful). I wouldn't recommend this to anyone I'm just saying I've done it before and I'm still kicking.
A suspension for IV use is NOT a good idea because that means there are solid particles suspended in the liquid, which have the potential to agglomerate and cause emboli (blockages) in the veins.