I’ve got portable zynth built in a small black standard box
And this has become a semi functioning mains power portable rig, which has trouble if not connected to a network outside, which ran at home with an Android tablet, but wouldn’t connect. Since the whole purpose of the exercise was not to have to take an hdmi monitor around with me, it, like many of my projects fell by the wayside 
I got it running with realvnc, and seem to remember having to have a real account with talk of a limited number of connections. I ran it as a hotspot.
The available display options obviously are oblivious to an official kit and rightfully so, it’s us poor souls on the other side of the custom click, which end up in the vnc Xwindows world . .
VNC to me would seem to be a default option that should be available on the Display Admin function.That way a remote android or windows or mac or phone can grab a standard located server with a known security model, and it just goes, which is the swiss army approach… 
It helps those it the 3B world as it gives them a default screen when none is present which is a boot up blocker. Another reason why zynthian-amp.local ain’t getting any love at the moment . . . 
Given the current external mission is the recording of church bells in stereo ( ). The lack of a headless boot up and an easy vnc read only ( I’ve got encoders ) is blocking it , and we are also keen to try locating the zynthian.local up there to see if we can fool anybody with zynth bells, and that before we start talking about tune rendition with the notes that ain’t in the bells scale . . . . .
Now how about that as a performance !!!