Firewire 800 to VGA?

Hey guys and gals. I've run into an issue. In September, I bought the 21.5" iMac (Mid 2011) which of course has Thunderbolt. I intend on getting a 21.5" Dell Display to accompany my awesome new iMac. (insane machine. renders 1080p like a beast) I've decided to get the Dell display since it has HDMI, which I will use with an Xbox 360.

This is all relevant, since I also want to purchase Blackmagic Design's Thunderbolt HDMI Capture Card, the Intensity Extreme to record gameplay. As you may know, the 21.5" iMac only has one Thunderbolt port. For the display, I'd need to use it for Mini-DV to VGA, and for the Intensity Extreme, I'd need to use it since it uses Thunderbolt.

So, is it possible to use Firewire 800 for the display? Is there a Firewire 800 to VGA adapter on the market? Or alternatively, Is there a Thunderbolt hub or any plan to make one?

Thanks guys.

To answer any questions:

1. Blackmagic doesn't make a USB or Firewire capture card, only PCI Express and USB 3.0, neither of which the iMac support.

2. I don't want to settle for a different capture card like, say, the Hauppague HD PVR. Sure the quality is nice, but Component cables are very messy and the Dell display that I'd like is HDMI. Very handy.