When creating a charecter, you normally can't use the manual alt+numpad (unless the 5 combos I tried don't work at all)

But, there's an alternative method to get past this.
http://www.xs4all.nl/~marktfd/vzkeys.htm
type your character's name in notepad.

When you have completed the word you want your name to be, select it and press ctrl+c
Now, go into Sins and make a charecter. When naming it, press ctrl+v and your custom-letter name will appear.

For example, my charecter name is : ƒ¦ùƒƒŸ

Minor note: if this is against your rules, just warn me and I'll gladly delete my charecter.
EDIT: Playing a game disables *some* of the characters, however some are still there.