FMC problem in dualhead mode

Hi folks,I am preparing to build a homecockpit of a 737NG. My software shall be PMDG's 737-800 which like a lot. My pitfall at the moment is to move the FMC screen (in an ideal world it would only be the screen w/o the FMC-body itself) to a seperate display which is 5" but has 1280x720 native screen resolution. I found no way to shrink the resolution nor a way to size the window in a appropiate way so that it would fit into my engraved and milled FMC panel.Can you give me hint on how I could solve my problem and possibly only show the screen (like PM does??).Best regards,Phillip