I'm sure Patrick Gainer will be along to provide the best answer, but in the mean time I'll post my speculation. Then I'll see how right I am when Patrick comes by.
Ascorbic acid developers become more acidic after development, so you could probably replenish with PC-TEA. 500 ml of PC-TEA will develop 160 square inches of film (a 220 roll), so perhaps 5-10 ml of added PC-TEA per sheet would be about right.
But I don't think this scheme will work for 40 sheets, because you'll get bromide build-up in the developer that will change things no matter how you replenish. Better to dump every 5-10 sheets or so, especially since the developer will be susceptible to aerial oxidation.