Yeah. Collapsing to a single /48 is gonna be step 1. I'm still uncertain how to partition it so that certain IPv6 ranges (e.g. /56) end up on certain virtual networks. [@gary_alderson](https://infosec.exchange/@gary_alderson ) suggested asking on the #mikrotik forums and I think that's a good next step.
I got on the phone with verizon support today and went through 4 humans. They swear that if I have a static IPv4 assignment on business internet (which I do) then I get on IPv6 at all.
I don't think that's true. I think there's some dynamically assigned range that they're advertising, but (a) it's dynamic. It could change, (b) their support people know **nothing** about IPv6.