I did some testing today and it looks like I average right around 5 GPM from the faucet running off the pressure tank which will fluctuate from ~40 PSI to 60 PSI. The downside is that the pump will keep cycling.

With a hose connected at the inflow to the pressure tank I get ~10 GPM maintaining a constant 50 PSI. I looked for a connector to go from garden hose to the PEX connector on the distribution manifold but it appears the manifold uses a proprietary design as far as sealing the connection as the adapter I tried leaked at the top of the PEX connector.

Looks like I'm going to have to live with the fluctuating water level for the time being unless I can solve the connector issue. I could install some sort of a tee connection with a shutoff but that seems a bit Rube Goldberg since we're looking at selling in a few years.