After some fiddling … ipv6 is also live. I kindly got a /48 ip range from NCRYPTD Ltd UK to use for my project.
2a12:8fc6:600::/48 is now live with 2a12:8fc6:600:177:1:1::1 and 2a12:8fc6:600:177:1:1::2 beeing the routers for the platform and act as termination for tunnels.