It can be done... How do ya’ll think I was able to try THCV?

(CBDV isomerization)
No glacial acetic acid needed. 1g CBD to 10ml alcohol (methanol, ethanol or isopropyl will do) then drop in 1 drop of conc. sulfuric acid. Reflux for 2-3hours, then let cool. Flood with 10-20ml dh2o and the oil will separate. Carefully pipette off the water leaving the oil droplets. Wash again with fresh distilled water, removing same as before.
Now re-dissolve the oil leftover in minimal amount of fresh alcohol, suck it up and drop it into an appropriate concentrate container (little wide glass jars often sold in). Let the alcohol evaporate and you’ll now have all that oil contained in an area that will be easy to retrieve.
This produces THC with zero THCA, so the end product is an oil not a crystalline solid. Very potent stuff though. Makes for good edibles too.
-GC