And... We have progress! Something tells me this will get fixed! Below is the email from OPNAV:
"Thanks for the email and please, don't worry about bothering me. Working to untangle things is one of my job requirements. You are correct that the 2300 ESRs do include non-URL designators. The difference between the ESR document and the NAVADMIN 011/15 regarding 2300 eligibility has not yet been resolved. We are actively engaged with the non-URL communities to determine the best way forward."