I presume this likely isn't your personal vehicle, right?
If 5k miles is the typical limit, how'd it get to 7k miles?
If you cannot extend the OCI, then the other alternative is to get the least expensive CJ-4 HDEO you can find. That may or may not be the current product; I have no idea what is paid. 5k miles could easily be handled by any house brand such as ST; often costs less than brand name products.
And, why pay for the UOA just to ignore the data it gives?
My point it this:
If 5k miles is the targeted OCI, and there is no hope of extension, then why the brand name lube and the UOAs? Yes - getting under the truck has some benefit, but that's not really reflected in the OCI costs. The ability to see leaks or loose tie-rod ends has nothing to do with the cost per gallon of the lube.
Interestingly, the "new" 6.7L coming out soon will be rated for 15k miles OEM OCI, all on CJ-4 qualified lubes. I'm sure that Cummins did a LOT of testing (far more than the typical BITOGer could ever manange in his garage with his limited wallet); if they see it as viable, then it's probably OK. The Cummins is not known to be a sludger, after all.
Cummins see the value in safe extensions. The UOA you posted shows there is value to be found in safe extensions. Perhaps it's time to rethink the 5k mile limits, or get a cheaper lube ...