The RealPrice was added so you could display it if you wanted to.
You could still display the Price (orignial price), Surcharge (additional charge) and RealPrice (added together) independently or save them independently in the database.
If you remove it from the TotalPrice, then you can add it as a charge instead by using the total of the Surcharge column. You don't need the RealPrice calculation if you aren't displaying it.
Once you add the charge, you can add whatever label you want to it. The default "Charges" text is just text on the page that is freely editable.
If you want to sign up for a premium support ticket we can get through all of this in an hour session and I can answer any remaining questions and make sure it is all working correctly.