Any AS object that provides policy already has many import and export
statements. Today IPv4 and IPv6 policy does not match so different
statements are needed anyway. For example, AS3561 has 737 import
statements and 738 export statements. I would venture to guess their
IPv6 policy is a lot simpler.
My high level policy (ignoring encoding it in some language) is likely
to be the same irrespective of whether it is IPv4 or IPv6. My
_application_ of that policy to a peer may be different, ie if the peer
doesn't speak IPv4 there would be no need to include any IPv4 components.