First, I have done much searching on this subject. I read that escooters are illegal and ebikes are legal in the UK (broadly speaking, if 250W, pedal assist and speed limited). It seems to me that the main difference between an ebike and escooter is that the bike must have pedals and the ebike be pedal assist. Does than mean I could put pedals on a raised escooter (with a seat) and call it an ebike? Question applies mainly to UK, US and EU please, but local only knowledge will be welcome too. Target wheel sizes are 8" front and 6" rear.
In a related question, e-tricycles seem to be identical in law to ebikes. However, would very small twin back wheels get it classed as an escooter? (eg: both 5 inch). My aim is to make a very compact foldable ebike for dragging on trains and across very large concourses. Don't feel as if you have to answer both questions :-)
Sample etrike for ref from here (ps: I prefer much smaller)