Wireguard PostUP?? or ipv6 tunneling

[Bytechanger]

Hi,

I want to tunnel all my traffic from mobile to OPNSense to internet (ipv4 and ipv6).
For ipv6 I set private ipv6 addresses.
Now OPNSense has to masquerade ipv6 to its public ipv6...

So I need to set up e.g.
  command      ip -6 neigh add proxy fdc0:9999:9999::2 dev wg0
Is there a way to do so?

Greets

byte