I don't think its worth it.
for easy and the least margin of error, put it in a standard corny with a lid like this
hang your oak spiral in the mead, store it at room temp with only 3-5psi to seal the lid and it wont carbonate.
oak spirals are cheap, come in various toast levels so if you don't like medium your not tied into the barrel you have.
even if your not set up to keg, a corny, the lid, and an CO2 cartridge charger (you dont need a lot of gas for storage aging) will be less than a a good barrel and will have other brewing uses later.
its all SS and known good, sometimes you have to go through 2-3 barrels to get a good one.