3D CAD design drawing

I have a 6 sided custom dice already made (see stp file and pdf file attached). This dice is perfectly balanced so that the center of gravity is in the middle. This is achieved by drilling the hole depths of the pips at varying depths so that the equal amount of mass is removed from each face of the dice. I need this same dice recreated with the same size and shape and dimensions but instead of pips to have numerals on each face. I just finished a Kickstarter project ([login to view URL]) which has other dice (4 sided, 8 sided, 10 sided, 12 sided, 20 sided) that use numerals. (examples: [login to view URL] and [login to view URL]). Now I want the 6 sided dice to also use numerals. On the other dice with numerals we were able to balance the weight by a combination of varying the numeral depth to remove the same mass of weight from each opposing face of the dice. In a few instances we needed to also shift the numeral slightly off center on one face or the other to achieve balance. If you can use the current stp file for the 12mm die with pips and instead of using pips use numerals (keeping the weight balanced) please let me know. I need this task completed today because my deadline to place the final order with the factory is today.