I have went ahead and bought 10 kits.

Then I tried to find matching switches quickly on Farnell - there were none.

So I ordered 10 sets of 10 switches that looked suitable from eBay.

They took a month to arrive and turned out to be of wrong size.

By that time I have lost interest and just bought a decade box from Farnell.

In the end everyone's a winner.

Leo