After several failed attempts due to strange error (CLI failing to start, add-ons installing but never finishing install etc). I have the Pi4 4gb up and running with HACS. OmniLinkBridge installed easily, MQTT no problem, configued and talking to my Omni Pro II. HomekitBridge setup and bridging my lighting to HomeKit. Wish I could figure out how to limit what HomeKitBridge brings over as I have around 60 lights but there is 243 entities that you don't have a choice but to add them and then hide them in Homekit. Now working on getting Plex and Alexa integrated.