Very recently I was sifting the Interweb and unearthed a Swiss site:
https://www.computissimo.ch/v-ang/
This seems to be dormant/for sale. But has some interesting items.
Especially the UC1003 shown below. It looks like this may be the only information ever available.
The board has a 6-digit display so unlikely to be a clone of the NS Introkit.
Looks something like the NS SC/MP Development System.