You can ‘drag and drop’ the current contents of the MONTAGE Sequencer into Cubase, be it a Pattern Scene or a Song. It takes less time than writing that last sentence. You should add this to your workflow. There is no need to do what you’re asking.
You’ll want to configure Cubase so that when you click on the “Import” feature in MONTAGE CONNECT, you simply drag the icon into the Track field at the measure you desire and Cubase will automatically do with the data what you tell it to do when you Import MIDI Files.
Please show exact screenshots of how to do this. It sounds like magic. Hard to believe it's possible.
Please keep the following in mind:
Have you ever tried to setup Cubase to work with a Montage or MODX from scratch, without all your knowledge of every single caveat, workaround, conditional, requirement, mechanic and configuration detail that needs be attended to?
Have you ever set that all up, and then had it stop working/connecting properly, and had to try to figure out why, without all your prerequisite knowledge?
The experience that everyone else has is not nearly the same as that which you have. You've got a restored backup file of memories filled with diagnostic knowledge, incredible insights into the nuances and nightmares of DAW to Montage/MODX and you don't even seem to know it, nor know that everyone else does not have this.
And... just in case you've forgotten, or don't know this, getting any DAW to reliably work with any keyboard is a nightmare of issues, over and over again. The Montage/MODX magnify this with their approaches to MIDI.
Please understand, that massive array of matrices for trouble shooting that is your brain is unique to you.
Everybody else wants to throw their computers and keyboards out a window, regularly, because of the infuriating foibles of Operating Systems vs MIDI Connectivity vs MIDI instruments.