If not careful here you could end up with a Midi infinite loop situation which could crash MT Pro (or any other application that gets flooded with MIDI loop feedback. If you need to do double translation, it is best either to use rules for a single translation or timers with global variables to pass values from one translator to the next.
On Windows, only one application can access any given MIDI port at a time. In Cubase, have it point to a Virtual port only and have MT Pro send and receive anything from the real controller to the virtual port using the static MIDI router. You simply draw lines between the input and output port. Then use translators with “swallow” set for any MIDI messages you don’t want to go to the MIDI thru path you have drawn.
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