[exim] routers using result of helo check in acl

Hi
I would like to use a helo verify check in the rcpt acl. For mail that passes, I would like to deliver using a normal dnslookup router, but rather than reject those who fail the helo verify check, I would like to forward them to another mail server where they could be scanned for virus/spam but I don't know how to do this second bit.
Can this be done and how?
Thanks
Martin