Persimmon Experimental

The Hachiya persimmons juice output are difficult to gauge. I have around 200+ that I will be juicing and expect to result in around 3 gallons of juice (I have access to a tree and may pick more if necessary to achieve 3 gallons). I am trying an approach to remove bitterness chalky taste via turning soluble tannins into insoluble tannins, I found research as well as commercial practice in Israel that uses CO2 gas at 80-90% in a sealed container with the fruit for 24 hours at 30C (86F) to remove tannins. Due to being in winter I will be trying Near 100% CO2 and 21C(70F) for 40 hours. I will be utilizing my corny keg for this. Apparently within 5 days of CO2 treatment fruit will ripen completely and NEED to be used to avoid spoilage(I assume soluble tannins act as a preservative).

Goal:
My goal with this beer is to resurrect and potentially improve an old recipe that is a few hundred years old. I could buy "Victory malt" for its cookie flavor but have heaps of viking dextrin malt and vienna barke, so I hope that by mixing these two in equal portions will create a baked cookie effect and a weak base wort. At the end of the boil I intend to add the juice for sterilization without damaging too many of the aromatics (10 minutes). I may also add some honey at end of fermentation as well as potassium sorbate to stop fermentation. I am kegging this and force carb-ing to 3vols.