@DiscreetFX
I applaud your dedication in 1) getting the VT sources opened and 2) continuing to promote their improvement. But I've got to say I agree with pretty much everyone here when I conclude: Why a re-implementation in FPGA? This seems utterly pointless.
The (already improved by the experts over the last 15 years) hardware is already there (VT4/5 etc) in PCI form-factor. Why re-invent the wheel?
Your 'un-named client' would be able to buy around 120 Video Toaster cards off Ebay with $12,000, so hardware lifetime is not really this issue here is it?
So perhaps you just need to manage your clients expectations somewhat.
I guess the 'no interest' refers to Newtek's lack of interest in porting the modern suite rather than the users lack of interest in using it.
However, them may be willing to open up the driver specification, and allow drivers to be written for AmigaOS/MorphOS for their hardware. Then, via a common API, the hardware would be useable by any VE suite on the Amiga. This would be half the battle - if we are to have a modern updated VE suite, then it does not want to be tied to a hardware dongle, or hard-coded to only work with a particular capture/output device.
Additionally, in this day and age there is no real need for a realtime mixer output or genlock - far easier to accomplish with software: capture the video, save to digital file format, edit/mask at leisure, and play as many times as you want.
Again, I admire your enthusiasm, and respect the right to privacy of your 'anonymous client' (again), but I think that you have a responsibility to manage your clients expectations realistically. If (s)he truly wants something useful, then start a bounty to get an updated VE suite (either Newtek's or another) ported to PPC AmigaOS/MorphOS or AROS, and petition Newtek (or some other manufacturer) to give you sufficient details to write a hardware driver.
I suspect this approach would be easier, quicker, cheaper, more useful, with better results, more easily maintained (lets think about the future here too) and with a more realistic prospect of someone taking up the challenge.
Just my 40% of a shillings-worth, and meant in a constructive way. :-)