You basically describe my workflow ;) I have Logic and Vuo hooked up via MIDI (IAC driver) and pipe audio through Sound flower into Vuo. I can record live into Syphon Recorder but when I can't run my composition in realtime I need to jump through hoops to get Vuo do my bidding.
Currently as a workaround I use the "Record and Play Values" node to record incoming MIDI data live to CSV files. While rendering the Vuo composition offline I switch the "Record and Play Values" node to playback. After rendering I add the audio in Quicktime or FCP.
However this way it can be a little difficult to exactly match the starting point of the recorded MIDI data, this can be overcome by adding an offset time (add a number) so both start at the required time.