Vacuum packer is a thing I don't have. Might work. I've heard conflicting things about freezing (I've tried it with lesser beans in Tupperware, didn't seem to make much difference either way)
unless the tupperware is completely airtight, oxygen will still leak into the container and cause oxidation. This deteriorates the bean.
The cold temperature will slow evatoration of the volatiles from the bean, but it is unstoppable.
Vaccume sealing will drastically slowdown the oxidation, but since you cannot truly get a 100% vaccume, there will still be some oxygen in the bag, which will cause oxidation anyway. It will just be a bit better than nothing.
And then unthawing the beans requires a moisture free environment (e.g, take it out of the freezer for 24hrs without unsealing it), or the beans will spoil. Once unthawed, i dont believe refreezing will work - it will just spoil it.
So yes, preserving beans' freshness is difficult, and bound to fail eventually. Might as well just pay for fresh beans, and pay for the transportation and packaging (which, i guess is the overhead, and makes buying small quantities more expensive...)
Have you tried vacuum packaging and freezing it? You want to vacuum package it so no moisture is trapped with the beans.