Thanks for the write-up, I've been interested in connecting RF-controlled devices to Home Assistant myself lately! Your experience will definitely come in handy :)
Are you following HA's latest push towards proxy devices? A few months back, they have been improving support for RF and infrared controlled devices through proxy hardware — as far as I understand, it lets you have just one RF transmitter in the home and have several integrations use it for sending their chosen commands on their chosen frequency, a sort of transport/logic decoupling. It's new, so there's not a lot of stuff that uses these proxies, but I want to play around with them and wanted to get them on your radar as well!