this is the “standard” solution to your problem: Free (BUT OLD) Hemp Biomass-to-Isolate SOP (complete) using cryo EtOH, wiped film dist., with C7 (re)crystallization
doesn’t get you “same consistency”, does get you compliant.
chromatography will get you past the goal posts, but the consumables and solvent recovery requirements are not inexpensive.
other than chromatography, or crystallization, there really is no way to simply “remove” the THC from your CBD. there are certainly folks who will sell you fancy machines that will degrade cannabinoids using heat or UV light, and THC seems to degrade at a faster rate than CBD, but you’re not going to hit compliant levels that way without sacrificing a LOT of CBD.
if you don’t have the ability to remediate your product, you might consider selling what you have to folks who can.