Hello Jedi,
It should be possible to use 2 different MIDI devices simultaneously with CueluxPro. The easiest way is via Show Control. There, you can have multiple MIDI sources, listening to different MIDI devices (you have to set an identifier for the source, allowing you to select different devices). So, even if there is overlap between the channel indexes of the different devices, there should not be a conflict between them.
Hope this helps,
Best regards,
Jurrien