Yes

What has complicated matters (and I've seen threads from others with the same issue) is that I want to be able to have the family just switch on the TV (plasma) and watch content without needing the home cinema kit on, PLUS being able to then have the full surround sound experience when watching movies, whilst sticking with the G68 processor for the time being.

I've also got a compounding problem that my HD621 and plasma won't work together properly (possibly a HD621 set up / firmware issue I've not resolved) so the video out isn't working at the moment.

Because the G68 doesn't have any HMDI inputs and won't process the latest codecs, I need a combination of the HD621 and some way of sending the right form of data into the HD621 so it will process the signal.

The Vertex2 looks like it will address this as it has a HDMI output specifically designed for this (the audio feed) i.e. as you said, it will take in all possible audio formats and allow them to be sent to the processor via a suitable HDMI feed.

Most people just have a modern processor where you can plug everything into the processor via HDMI and feed a signal to the screen and everything is fine. I think my journey will now be to get the Vertex2 in and working, fix an unrelated intermittent problem with the G68 (via Mr Tech Guy's repair service) and then when funds allow, sell that and the HD621, and replace them with a new processor, a new 4k Bluray player, and a new 4K screen.

I may also add in the speakers and amps for a 7.1.4 atmos system as well....but that could be a few years off (budget related and when there is more content to make it worthwhile).

Home Cinema: Panasonic DMPBDT700, G68, Jeff Rowland MC6, Adept Response AR8, 803 Diamond, HTM3s, ASW855x2, CCM816x2, Pioneer 506XDE, Nordost / Au24 cables
Stereo: 808i.2, Audio Research Ref 3, Canary Audio 303s monos (modified), Adept Response AR8, Living Voice OBX-RW, Valhalla cabling