Dual video card to single KVM port to dual monitors

All. I'm trying to figure out a solution to a problem at work. We have a software test lab setup. We need to be able to test on dual monitors, but we have a bunch of machines going through a KVM switch. So the setup is as follows:

Dell Computer (we several computers)
USB/VGA to Ethernet Altusen adapter
ATEN Altusen KM0432 32 Port KVM switch
ATEN Altusen KA 9272 KVM Console Module
Dell Monitor

Is there some way to use a video splitter to combine the output from two VGA ports on a computer, send it through the KVM as a single video source, then output it to two monitors? I saw there are some small desktop KVM's that will do dual monitors for a few machines, but we have probably 15 computers, and three dual monitor seats for testers to use. Is there someway to make this happen (ideally with our current equipment)?

Thanks,
Ben