Creating a custom character set order?

I've got a small project for which I'd like to build a custom LOCALE, identical to my usual one but with a non-standard character set order. The modified order would be very minor - putting about 3 7-bit characters in a different position within the sort order (for both ascii + Unicode purposes) to match another system whose data uses a different order.

The man pages and source are a bit too convoluted to be sure of what's needed:
  1. Which file(s) define the character order for a locale, in the OS?
  2. What steps must I do, to rebuild this file with a modified character order?
Thank you for any help you can give. More explicit and "hands-on" detail would be really appreciated, since I'm not that familiar with the low level source tree or its automated build tools.
 
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