did you contact that guy?
http://nordicgroup.us/fold/#Microbike

He is wrong about the dimension on wheels.
The plastic ones was 12" and the metal ones was 16"
but only made by hand some 200 plus to find out the market
for it but not enough interest so they gave up on the Microbike.

I made a phone call to "Paulo" here in Sweden who was involved to the end and he has not a single part and don't know who has it either. He recommend we buy a used one and take parts from the bike that is most used so one have at least one good working one.

I would look into the version for USA which had three speed rear hub
with metal rims or look if it is possible to use Mobiky rear wheels despite
them being chain driven? and to move the part for the plastic gear for kevlar drive belt? But maybe me too naive if such is possible.

"Paulo" didn't indicate it was ok to contact him so I will not give out his email address. He told me he know nothing about where to find parts so
we have to do without his advice. If he reads here he could confirm my
take on it.

I know not enough on how these kevlar drives are attached. I am folder
enthusiast but not good at mechanics I just love small wheeled foldable bikes.

"Pauolo" told me he was sure of that even the rear wheel is available where they bought it but he gave me no name of firms or companies. The kevlar drive belt seems to be a standard though. and the front wheel is standard too. Others have told me the same as you do. They have failed to find one.

So not sure why he wrote that it is easy to find them.

All help is appreciated.