Hello,
This sounds very interesting, I do have some understanding of digital identity and biometrics thanks to my other work as a researcher. In terms of talking head videos, this should be really easy to edit, we can even disguise some of the cuts with perhaps some relevant charts, diagrams and b-roll to make it more professional. I would love to know when is good for you and to find out more about the project - namely what platforms this would go on and how many invidivual videos are you going to produce. I film a lot of this type of video at Expos, so I am well versed in the format.
I have included 25 hours but obviously depending on the amount of talking-heads needed this can go up or down. These don't sound like particularly daunting videos to edit so I imagine down is most likely.
Just a bit about me, I am a videographer, photographer and editor who has a Black Magic camera and Da Vinci Resolve (professional quality editing software). I have a good selection of lenses and audio equipment as well, alongside essentials such as a tripod, making me a very self-reliant shooter.