I finally got IPv6 working at home over the weekend. I ended up doing it with custom router hardware from PC Engines (in my case the very capable APU with 4GB memory [$131+$10 enclosure], a 16GB mSATA SSHD [$24.99], and three gigabit Ethernet ports) running pfSense.
Couple of hiccoughs along the way:
- Completely forgot about the all-important null modem cable.
- Needed to find driver for my USB-DB9 serial adapter that runs under macOS Sierra (Prolific PL2303 chipset well-supported)
- Needed to find an appropriate terminal emulator (screen works well)