So it’s not about filtration.
It’s about color remediation.
It’s not misguided, simply not described worth a damn till this point, which made it harder to be helpful 
You are not using AC to filter ethanol.
You are using the butcher to filter the AC out of your tincture.
You would also be using that bed of diatomaceous earth in your buchner to filter out the ac (depth/3D filtration).
I assume you have read EHO Color Remediation
Edit: so when you say “buchner” are you actually referring to one of these?
Because the usalabs “buchner” is a perfectly usable filtration device, but it’s not a buchner. A buchner does not require the addition of a sintered disk.
Buchners, especially glass ones, may have a sintered frit, but if the don’t have one, adding one is not standard practice