This device strikes me as a perfect "Stan Device"-- a complicated and somewhat expensive method to accomplish something very simple. When it comes to the Speedster, I generally default to the most difficult solution to whatever task I'm trying to accomplish. This is how one arrives at a dry-sump and a twin-plug arrangement, or why less reasonable members here would expend freaky amounts of effort and money to run beehive valve-springs.
But like @edsnova, I don't think this is for me.
In defense of the idea, though-- I couldn't personally get over the shame of a center mounted e-brake until after I spent the big bucks to have the (much less useful) umbrella e-brake installed in my coach back in 2005, so I completely understand the appeal. Like a lot of things that bug only the owner, perhaps it takes going to the effort and expense of getting rid of the hated thing to arrive at the conclusion that it wasn't really that bad to start with.
Yes, the center e-brake is a "tell". But now, 20 years on, I'm way, way past caring. For me, more often than not I wish the visual connection to the original 356 could be well and finally severed-- so that people would judge the car for what it is, rather than to how carefully and faithfully it hews to the aesthetic of the original. It would be easier to make the leap into another (more practical) automotive endeavor, if only the original wasn't so achingly beautiful.
If I ever do this again (and I hope to build my own someday), I'll likely bite the bullet and get a stainless 550 e-brake handle from Fibersteel or Ming at Vintage (which would likely cost more than this electronic device)
... or maybe by then I will be completely over myself and just put in a completely functional, simple, and inexpensive Beetle handle and spend the effort and money on other things.