Yes that was also my concern (the video being a bit older). I have received Florent his contact details through a private message exchange on the matra passion forum with one of the people who helped design that board. I contacted him and got a repy the same or the next day. I believe he makes them to order through his company or the company he works for Elecflo in Belgium. I paid a little over €200 because I asked for a B2B invoice. (I use the Murena as a company car) For private individuals the price is a little lower.
I do like your approach and I'm all for reducing waste. There's still a bunch of used ones for sale on leboncoin that look in good condition. Here's the link if anyone is interested: https://www.leboncoin.fr/ad/equipement_auto/2340861756
I heard it's a bit hard to use that website for non-french people though. Possibly due to registration address requirements but I haven't tried signing up personally.