Use a virtual framebuffer to emulate a DP-x device
 

To enable a disposabele monitor on "any" device and in order to use xrandr, a-randr display settings etc in my linux distro.
I an Xvfb running with a virtual X display.

I would like to feed this display to an emulated
DP-x disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1440x2560+0+0 right (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 59.95*+
1920x1200 59.88

I that anyway possible?