I got a stumper of a question

I got my nice G3 MT with the Wings AV Card Installed- I have a decent Rage PCI installed and im running my 15inch LCD off that monitor. Apple Video Player Wont display the video unless im connected to the Onboard video. Of course I dont have a Mac-VGA Adapter lying around, Im wondering if there is a way around this as I dont want to put a big heavy CRT monitor on my table. I mod original xboxes and the video input is very handy