Force headless Mini to recognize main display?

My church has a Mac Mini mounted WAY up high in the ceiling trusses between two wide-format projectors. We use a Matrox Triple-Head-2-Go to combine the two projector's images into one double-wide display. Because of it's remote location, we ran a gigabit CAT6 cable to the Mini and control it remotely via VNC.
What I would LOVE to be able to do is to somehow force the Mini into "seeing" a main display on the HDMI port, and treat the Mini-Displayport that feeds the Triple-Head-2-Go as the secondary display, even though we don't have a physical display connected to the HDMI port. That way, we can VNC into the main display without effecting what's on the projectors.
Is there some way to do that in software? Or is there some kind of "dummy" HDMI dongle I can plug in that would make the Mini think there's a display connected to it?
Mark Petereit
www.fwcflorence.com

Sorry, I guess I needed to provide more detail. I need to be able to VNC into the main account that's driving the output to the secondary monitor.
I'm using a software package called ProPresenter. I need it's main control panel on the primary monitor so it can run its output to the secondary monitor. Except that I won't actually have a physical monitor attached to serve as the primary monitor, but it's that primary "monitor" that I need to see when I VNC in.

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Force headless Mini to recognize main display?

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