Access all devices from LIVE HASSIO instance (1st Pi) on a DEV HASSIO instance (2nd Pi)

OK, so I want to get into LoveLace but really do not want to upset the family because they love the existing HASSIO setup. So I was thinking, spin up another Pi, install HASSIO and just ‘connect’ to all the devices on the main PI, right?

Anyone know if this is possible at all?