You seem to have answered your own question. You want to do law, but you're not willing to go to a uni that's not sandstone. Of the two Victorian options, you'll only consider Monash but you don't think the required score is realistic.
If you want to study law, you'll have to compromise one/some of those decisions. Doing law at Deakin or VU will be significantly easier to get into, but you'll probably face some sort of barrier based on prestige, since that's fairly well entrenched in the legal community as far as I can tell. If you want to avoid that risk and stick with Monash/Melbourne, you'll have to contemplate doing post graduate law and risking not getting in. Plenty of students graduate from the JD (or equivalent) every year, so it's not like it's a lesser options
You can also go interstate, but I don't think the clearly in score at a comparable university is going to be significantly lower than at Monash.