This is my control panel Mod, since we are sharing. Since there is a check valve on the backside of the flush connection and the Rinse connection is well above the tank level. This setup adds shut off valves to either side and I have been running it this way for 3 years now. When I think about it, running 2 separate hoses, because a check valve COULD fail, then I would be affecting the main water supply instead. In other words, same problem either way. I have disinfected 24" water mains before, so I guess it is not a fear of mine. I guess you could even throw in another check valve if you wanted.
This setup allows me to use 1 hose, 1 flow meter, and I just simply throw valves to direct flow. The hoses are $11 mixer hoses used for washer machines. I also carry two (2) Camco 25' EvoFlex2 collapsible hoses. They save sooooo much storage space! I only need 25' to date, but I have a backup plan with the second one. They are very tough and easy to deal with on a cold day.
Note: The hoses are twisted, because it removed some tension to the 4-way garden hose splitter.