Not as simple as a button but I might have found a way to get a complete midi file combining several Dorico flows with variable instrumentations/divisi, while retaining a coherent tempo track/total duration and annotations all through the score, enabling easier post processing of the whole piece in favourite daw
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In Setup Page
Select each flow in turn and check box of any not highlighted Player track to get rid of evtl optimization and restore staves integrity through the whole piece and select last flow -
select anything in its first bar, Ctrl All + Ctrl C copies everything, select End Bar line of previous flow and Ctrl V to append content to it.
Repeat for all evtl. other earlier flows.
Provided Endpoint Setup and Expression Maps were set, my Synchron Players open, fully loaded with correct instruments
Tested it with Beethoven’s Op68 Symphony, all tempi are preserved as well as meters/annotations etc,