Using an app that is very close to stock-think the app says its taken from CM 10.2- and a tracfone APN I was able to get MMS working. the app is called 8sms and may be posted here but I found it in the play store.. just like stock but has APN settings. I will post up a screenshot of the settings I'm using. If you don't like the app icon, you can switch to the green kk message icon and there is a dark theme toggle!
my question is, can I take these settings and add them to the APN XML file and fix that way?