>>I work for a manufacturer of any kind of membrane keyboard,
>>here in Turin. http://www.k-tronic.it
>
> ask your webmaster to check the link to the english catalog!

Co-incidentally today we have a display on site of all sorts of industrial 
suppliers, and one of them is a distributor of a label printer. It prints 
onto vinyl for doing labels, warning signs, pamper proof labels etc.

I asked about using it to make membranes for keypads, and he said it was 
certainly possible. I am thinking along the lines of the site linked above 
where they talk about membrane with mechanical key (they mention using Omron 
or RAFI keys), but I guess it could also be done using membrane on rigid 
circuit board.

The company I saw here was specifically selling the printer and supplies 
http://www.lighthouse.uk.com/ but I suspect for a evaluation version you 
could go to a company that does vinyl advertising signs for small 
quantities. He also talked about being able to use a clear vinyl layer over 
the top to protect the printing from usage wear.

For the OP though, it may still be worth looking at the membrane ones under 
the standard keyboards. There are a half dozen or so of various sizes 
numeric with additional function and alpha keys. 

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