DNS Rewrite

Is there any way to hijack a DNS request or rewrite a DNS response through an LTM iRule?

I'm trying to get DNS to respond to internal requestors with a private NAT address (that may or may not be on the BigIP) for an Internet host that would ordinarily return a public address. I am able to do this in GTM through a WideIP with multiple aliases (so we can keep them all in one place) and the following iRule:

when DNS_REQUEST {
if {[IP::server_addr] equals "10.1.2.1"} {
switch [DNS::rrname] {
www.a.com { host 10.1.1.1 }
www.b.com { host 10.1.1.2 }
}
}
}

Unfortunately, I need to add another listener to GTM and send all of my outbound requests there to catch just a few hosts. I would rather have an LTM iRule that I could put on my outbound Network VS for udp:53 that could do the dirty work without changing the DNS server config. I have some iRule command references that indicate DNS commands exist (or existed at some point), but my BigIP running 9.2 doesn't seem to want to recognize them.

Any help or clarification is appreciated...