I still feel a MIDI Thru port inside Pianoteq would be more reliable, but this has become a lot less urgent for me.

I also looked at USB-splitters, but that seems or costly, or doubtfull. For instance, most simple USB-splitter-cables are only transferring data over 1 USB-out.
I did found these very promising gadgets:
https://www.iconnectivity.com/products/midi/mio2 and it's bigger brothers: https://www.iconnectivity.com/midi-interfaces-1

What I didn't try but could also be an option: MIDI over WIFI. In Mac OS X this build in, for Windows there is https://www.nerds.de/en/ipmidi.html and maybe more.

1 MIDI-Input
2 MIDI-Outputs

Interesting setup, would something like a MIDI splitter box work? (they also make 5 way, 20 way boxes etc.) Maybe some appropriate MIDI converter (USB to pins) cables would be required too.

Keyboard MIDI out to it, then run one output back to your machine, then the other to the other machine, no need for virtual port (maybe with less latency?).

Not that I have done anything like this, and unless I'm missing something it just seems worth posting in reply, in case it's good to go.

Case at hand: I'm playing in a trio, Unheard Music Concepts, when we make recordings on location, we're recording the audio of the bass and sax, and the MIDI of the piano into a DAW.
My portable piano only has 1 MIDI out (USB). The cleanest solution to making connections we found would be: FP30->laptop Windows 10 with Pianoteq -->laptop MIDI over USB out --> USBMIDI-interface -->MIDIcable--> another USBMIDIinterface --->laptop running the DAW.
On a Mac, or on LINUX it would be pretty easy to split/route the MIDI elsewhere, but on W10 I failed to find a solution, it seems Pianoteq is only accepting MIDI-input from an actual hardware-port, not from a virtual MIDIport.

The workaround we're using is FP30 ->laptop running DAW, from the DAW MIDI-through -> USBMIDI-interface -->MIDIcable--> another USBMIDIinterface --->laptop running Pianoteq. This seems just as straightforward, but in practice it's not. When we we're trying to do this with Reaper as DAW there was a lot of MIDI-latency when the MIDI arrived at Pianoteq, in the end there wasn't with Protools.

Of course another workaround would be just to use Pianoteq as a plugin inside a DAW, but for reasons of simplicity, and because of auto MIDI-recording I prefer to use the standalone version.

Anyway, it would also be very cool to have a MIDI-output port ;-)

Of course I'm totally open for suggestions, or if you got Pianoteq accpeting input from a virtual MIDI port on Windows: please let me know, in that case there must be something wrong with my W10.