I'm gonna go with setting up offline and connecting later, and manually downloading the security update. I hope that gets me the firmware the GOS website was talking about, while skirting around the edge of google until i get GOS installed.
next up, i think, is getting silent link set up. I'm not entirely sure i understand the difference between data.plus and no number. they say data.plus has "rock solid operation" but... i can't find any information beyond that