[exim] negative senders match in router condition

Hi Exim Users!

We use a stored_proc which returns the whitelist information of a
certain email account.

# query for recipients whitelist:
addresslist email_whitelist = ${lookup pgsql{select * from
get_whitelist('${quote_pgsql:$local_part}@${quote_pgsql:$domain}') }}

In the ACL it is used in this form:
  # drop E-Mails from senders found on DNS blacklists
  drop  message = DNSBL listed at $dnslist_domain\n$dnslist_text
        !authenticated  = *
        !senders        = +email_whitelist

Now I like to use email_whitelist in a router condition exactly like

        !senders        = +email_whitelist

How can one achieve this?
* A router has no "senders functionality"

I have checked the available expansion but:
* lookup : works only with files oder db
* inlist : Does not respect the fact the addresslist contains regular
expressions

I am sure I missed something. Any help appreciated

Volker

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