@sysadmin
While this is peripheral to your concern, note that (IIRC) the OpenStore client that runs on UT phones has a provision to use an alternate source by setting an environment variable (I think it is not done specifically for mirrors, it's to test the new store site version)
To get back to your problem, since your post has no substantive answer for 7 days, I'd say that you could raise this issue in the next Q&A since involved people are most near to the UT organization and the issue of mirrors is legit IMO.
Mirroring the packages repos by itself should not be a real problem only an organizational issue - they are public after all - but getting a formal approbation is considered a thing to do. Mirroring the openstore I don't know, I don't think it's accessible by FTP or something like that. Maybe it could be arranged, try to ask in the Q&A.