On my most recent work trip to the cabin, I managed to solve the PEX connections to hook the cabin’s one inch PEX line into the pressure tank and pumping system in the well house. The pressure tank is driven by a SHURflow Revolution 4008 series pump. The PEX piping starts at half inch and expands up to the one inch PEX the plumber used to feed the house. Within the cabin, the one inch PEX interfaces with a manifold and half inch lines are feed each final destination.
I had reservations that this pump would pressure the pressure and volume necessary for any level of pleasant pressure. Initial testing shows that there is some loss of volume, but the pressure is strong enough to use the sprayer on the kitchen sink. Next trip I will check the Rinnai hot water heater to see if the pressure is adequate to engage the burner.