But you are right - a tunnel is yet another way to solve the multihome issue. So now we got:
1) IPv6 with multiple prefixes
2) IPv6 with multiple prefixes and ULA
3) LISP: http://www.lisp4.net/
4) BGP multihome
5) NEMO and MIPv6: http://software.nautilus6.org/implementations.php
6) Custom tunnel
7) NAT66 (pre alpha version published on 15 Jul 2011: http://sourceforge.net/projects/nfnat66/).
We are currently doing 1) on a significantly larger network than the one you administer and it "just works". But I definitely think the future is 3). It might currently take some involvement to setup but that will change quickly.
The use cases and complaints that you have put forward are all solved by LISP and in a much better way than NAT66.
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