Bonjour,
To my opinion, there is no link between having a feed water pump or not as I always have a check valve with and the ferule for it is not the one for the regulator.
Furthermore when I don't navigate, I keep my boilers open and empty.
About the modification, it was a test for fun, I don't think it will change anything in the life of the membrane as soon as I assume that they have to be changed after a while. As long as the regulator is working properly, no need to touch anything after all.