Multiple cloned USPS modules?

I'd like to create a USPS shipping module for each USPS service (don't ask why...3rd party software restriction). I thought it was possible to copy the usps.php file to something like usps_priority.php and place it in the /includes/modules/shipping directory, but that doesn't seem to be working. I'm getting a few errors. One error is about not being able to redeclare the class, so I'm assuming I can rename it. The other is about missing english files, so I'm thinking I can copy those as well. Am I missing something? Is this possible?

Well, doing the rename partially worked. No more errors in the admin shipping module section, but it's coming up without any description or module name and a red dot. So something isn't working.

It's necessary, but insufficient, to simply create a copy of the usps.php file. You also need to change the names of the fields associated with the module.

For example, if your usps clone is usps_priority, you'd edit \includes\modules\shipping\usps_priority.php and \includes\english\modules\shipping\usps_priority.php and change all occurrences of USPS to USPS_PRIORITY.

Be careful on the use of the underscore ...

For example, cloning Flat you would NOT use:
flat_us FLAT_US
flat_priority FLAT_PRIORITY

you would use:
flatus FLATUS
flatpriority FLATPRIORITY

On the clone of USPS be careful on global variables so they do not get mixed up with one another as the modules run ...