The problem is, you don't have enough free chars for all abbreviations. A minimum of three chars is required for the "big" display numbers. The maximum number of chars is 8, so 5 left. And if you insert the chars from the more beautiful big numbers mod, nothing is left. So you would have to rewrite the chars memory in LCD every time you need the other set.
But if you get a beautiful solution, it would be fine
PS: I made an excel sheet and resized the cells so they form the LCD pixels. You can fill the black dots with an X an leave other empty. It's a fast method to create chars and see how they will look like.