The vehicle was designed for 100 kg with a big safety margin.
Are you joking? I weigh more than 100 kg dry and naked. I think a lot of the people (middle-aged and more) who might want to try an electric bike/trike ... well, I am not abnormally oversized.
Here in the u.S. men over 1.85 meter and 100 kg are not unusual .... and the older and fatter, the more an electric cycle would appeal ... except this one is unsafe even unloaded?
I weighed over 125 kg at one point and still could load my bike with 30-40 kg of gear or groceries with no issues.
What you have here is interesting ... and while it doesn't have to "fill a niche" or "replace" something in a niche .... it has to find a market, right? I am not trying to squelch the designer's creativity ... but if it doesn't offer anything but novelty, you might find that no one will be willing to pay a big ticket for a novelty.
How would you sell it? How would you do a feature/benefit breakdown? What would be the attractive features? It is less stable than a trike, no more stable than a bike, and weighs as much as a trike and more than a bike ... so it would have less range, less safety, and minimal carrying capacity.
Where is this designed to run? On roads with other bikes and cars? Only in quiet suburban neighborhoods? On MUPs? On unpaved trails? Where does it offer an Advantage?
I look at new products as a potential investor might, and as a salesman might. How would I sell it, who would I sell it to, how would I make back my money?
Sometimes I might underestimate the illogical appeal of a certain product ... maybe I am in this case. But it seems to me the market you are aiming at is small enough that people looking to lay out serious money (a couple to a few grand is the starting price for real electric bikes around where I live) would do a little research and not be so much moved by impulse buying or surface appeal.
It will be interesting to see if I ever see one of these on the road ... or even see an ad for one.
One never knows what might attract the attention of people looking to buy stuff.