First, you don't need to purchase anything to use the Write wizard. It's free, as are most of the Wizards. Only the Newfangled Solutions addons require a license.
I'd say that your best bet would be to write a VB macro to do what you want.
You'll need the macro to create the g-code for the numbers, or possibly call them from other macros. If you don't have any VB experience, you may be in for a steep learning curve. Or maybe not.
Depending on how many different numbers you'll need, then yes, it may be easier to do individual digits, rather than complete numbers.
You probably have more questions now?