There's no need to mix live and, at the same time, export what you are mixing. You'd gain absolutely nothing by doing it either, other than enshrining your errors is the exported audio.
Most complex mixes involving multiple fader/pot/button movements and hardware processors going direct to tape in the "old technology" days required more than one engineer to carry out because one human doesn't have enough appendages to work it all at the same time.
Mixing dub "old style" with a mixing desk, only hardware processing and tape recorder was a very hit and miss, trial and error affair. It also involved doing lots of bounce-downs and overdubs to make best use of a limited track count and limited available hardware, so recorded dub was hardly a "live" performance mix most of the time either.
Just enable automation on what you want to adjust and mix. If unhappy with the results simply edit the automation and think yourself lucky you don"t have to do re-runs of the whole thing until everything hangs together. When happy with the mix, export it.