I'm not very interested in experimenting with my stock or replenisher, either -- especially when it may be near my use-up date before I can buy more. It is, however, good to know that Eco-Pro ascorbate developer can be treated like Xtol overall. I can buy that and switch over if Xtol becomes hard to source for too long.
If Xtol were easy to get now, it would be another story (and you could make a case that if there's a problem I could just switch to the Eco-Pro) -- so I may give it a try eventually, especially if Xtol is still hard to find when I'm down to my last liter of Xtol replenisher.