None.
Several years ago when Ilford/Harman examined this, and made sales projections, and discussed it here, the cost of replacing or restoring their warn out machine that assembled the film, the leader and the trailer in production quantities at economic speed, the cost then was in the order of 300,000 pounds sterling, and the minimum order quantities for those leaders and trailers meant that they would have to buy and pay for several years of supply ahead of time.
There was no likely scenario that would result in any return on investment in any reasonable period of time.
As best as I can tell, it is the minimum order quantity for the leaders and trailers that precludes Kodak Alaris and Eastman Kodak from doing it as well. Their 220 equipment may also have been decommissioned.