After removing the docking station side panel, and drawers in the bedroom in order to access valves for winterizing a couple weeks ago, I decided to make it a little easier next year.
Lowe's has plastic access panels in the plumbing department that looked like they might do what I needed. I installed a 12x12 panel in the side of the docking station to access the water pump and siphon hose, and a 6x9 panel in the board below drawers in the bedroom to access the water heater bypass.
Didn't snap any pictures, but the install was straight forward. I marked around the panels and did the cutting with my Dewalt oscillating saw, then used silicone to attach them. I painted the panel in the bedroom with Krylon "coffee bean" brown, which is a pretty close match to the cappuccino.

https://www.lowes.com/pd/Acudor-12-i...nel/1000772952
https://www.lowes.com/pd/Oatey-Load-...Panels/3130137