Still, I don't see a reason why this should be done. If the PC communicates to other destinations than 192.168.1.0/24, the traffic won't go to the tunnel. If the destination is 192.168.1.0/24, following the default route will send it typically directly to the internet which doesn't make any sense to a private address as the destination.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...