Ah, I finally solved it through a rather tedious workaround. I surely hope that there's some easier way for this and that I could have just chosen another device type. This approach also requires a remote but luckily enough it doesn't matter how many channels it has as I'm only after the device type ...

Another bump, because now it's my turn to get stuck. :( I have four Hasta blinds that I'm having problems adding manually to Domoticz through an RFXCom. I also have a Hasta remote which I had no problem adding to Domoticz. I changed RFXCom to Blinds T0 and the remote code was read instantly, and was ...