Unfortunately no you can't do this for the very reason you state ie. you cannot send traffic straight back out the interface it has come in on with v6.3 but you can with v7.x.
That is why if you wanted a hub and spoke design where the spokes communicated with each other via the hub prior to v7.x of pix/ASA you needed to use a router which does not have the same limitation as pix v6.x.
The only way to achieve this is by configuring Multiple outside interfaces either by using seperate physical ports or an 802.1q VLANed outside port. You then have static routes pointed out one outside interface for the static VPN tunnel and you terminate that tunnel on that interface. The other outside interface is used for the other tunnel(s), dynamic or static.
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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...