I want to increase the Bluetooth range of Home Assistant to control an IKEA Idasen Desk and a SwitchBot. I already have a Raspberry Pi 3 near these devices because the Raspberry Pi 3 runs a print server.
Why don’t you just put another home assistant instance on the spare PI and use remote homeassiatance from HACS. It will send the sensors from the bluetooth sensors to your main HA. I haven’t used it in a couple of years but that’s exactly what I did before.