@ruggedmouse: I don't think that's gonna work. Also realize that compounds like this seem to partially degrade into chemicals that make it seem like a literal shit or manure infusion. I had that same thing happen yesterday with MiPT and it was only in a matter of moments. While that may not attest to the speed of degradation, consider if you want to have 500 mg of AMT turning into skatole-like poo compounds or buy / borrow a scale instead which honestly don't have to be that expensive at all.
Degradation doesn't work like having a grace period first where it is okay, then after some time it suddenly is destroyed. It starts right away and who can say after what time how much is left and how toxic the degradation products are, even if only severely nauseating. It could be a bitch to guess a dose when there is degradation at an unknown rate.
It's plausible that it is somewhat stable in the freezer, at least by physical chem law the degradation rate would drop. But realize that vodka does not freeze in a freezer so ionization in solution is still an issue. Maybe dilute to about 30 proof (15% vol) and go to at least minus 20 degrees centigrade.
Still I think there are way too many reasons to attempt this instead of getting a milligram scale which you are likely to rejoice for years to come. But it's your choice.