Hi dsavard. I understand that you are talking about USB - VGA converter. I am assuming you wish to connect this to your clamshell (oops seems you have a 6000, my mistake) and to do that you would need to go CF - USB - VGa... hence CF limitations.
Since though, you want to use the usb host (grrr, i want a usb host), this may prove viable although the host is usb1.1 and thus limited bandwidth? Keeping in mind though, that there have been usb-tv cards over usb1...