Linux and separate X displays for control and projection

Can anyone tell me - is it already possible to do something like:

xpra start :10
DISPLAY=:0 openlp --control-display=:10

and then on a laptop

xpra attach ssh:olpserver:10

I would like to run openlp on a headless server - using a single graphics card to drive the projector, and use XPRA or an xRDP session for the control window -- so I would connect to it via a tablet or laptop.

If not I'll have a look at the code. My other itch was having chord display on a /stage like view (/tabs?) but it seems others have scratched that itch already :)

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