IPv6 Only NS

[Matt]

I am using Bind for caching only.  Currently my VM only has IPv4
access.  Is there a way to selectively forward any requests that only
have IPv6 nameservers to another DNS server that is dual stacked?

If not is there a way to forward all requests that are not cached to a
parent nameserver?  Also, is there a way to specify a backup parent NS
and ONLY use it if primary fails?