You can. Go here.
http://www.pckeyboard.com/page/Buttons/PRK
I believe you want a Pearl (white) 0 key.
So you put in the characters. 0/ins (numpad 1u) for the description.
I had no trouble ordering a 1u + key from them. I am pretty sure they can do a 1u 0 (numpad) for you.
Show Image
(http://i.imgur.com/IZmzOI6.jpg)
Edit: I had to show what I was talking about there.... ;)
Yes, Unicomp will print custom 1x key all day long. I am glad they now have multiwide keys available, already placed an order for some keys. But - they won't yet custom print multiwide keys.
They can print custom anything, but sometimes you need to prompt them. They have done a key which says HDD and then SSD underneath for a 1x key for me. But it took a bit of back and forth i.e.. they said they couldn't do it and I said that I heard they could and described the printing process that someone posted somewhere. I was nice of course and played the dumb card a bit stating that I must have heard wrong. Well they ended up doing the cap for me and sending me all the alternate caps that I had specified in case they couldn't.
I bet they would do custom printed multi wide keys, if you asked and poked them a bit. But in saying that I bet they would do it for one person and then not do it for another just to keep it random. Its not random unless its Unicomp random.