A 3B+ will happily run Domoticz. But do be aware that Raspberry Pis are notorious for chewing through the limited write-lifetime of SD cards. There's...
I don't understand how that could possibly work. The CS92A is a send-only device. There's no way for it to know that you've pressed the BDR91 button....
I run the web agency CST Group, write a monthly column for PC Pro (mostly about 'connected' technology), and am a director of Demographix online surveys.