Hang around lowendtalk / lowendbox and rent a tiny dir cheap VPS. Just SSH there and use the SOCKS5 proxy built into SSH. I hope they will not block SSH any time soon.
If they do you can set up a HTTPS website on your VPS with a secret proxy.
Similarly, I've recently discovered how to send encrypted email from your command line, really really easy (note that Gmail throws these away if they come from an invalid domain name).
`echo "This is a secret message" | gpg -e -a -r "recipients@gpg.key" | mail -s "Your eyecatching subject line" recipients-email@example.com`
GFW already does that. it's not that hard either, if you're using ssh for forwarding purposes, chances are you're using way more bandwidth than if you're using it for teletype only.
Where can I read more about that?
Individually blocking IPv6 addresses, as /128s, would indeed be futile.