... the RM Broadlink learns X10 RF directly,...
Well then....
That could make the RM Broadlink a major help in making X10 a part of an Alexa setup. My RM Broadlink is setting in my living room... controlling the TV I use for daily TV viewing. Which puts the unit almost directly one floor above my CM15A. The RM Broadlink is much cheaper than... say, a [homeseer] hometroller.
I have one routine involving the RM Broadlink, that besides turning off the TV and cable box set top.....also utilizes my Wink Hub to turn off a Cree wifi bulb. As well as an ihome module directly through the Alexa/echo device to turn off an LED strip... AND an Etekcity (wifi) module to lock out my theater style chair, while also signaling my Hometroller to signal with an X10 PLC which triggers a macro in another CM15A.
As complex as this might sound/read.... the setup is super simple and works flawlessly.