[Exim] Partial searches and NISPLUS

I'm trying to convert a sendmail installation to exim, and it's been set
up to use nisplus for a virtual mail database. I have it working fine
for regular addresses, where the alias is

joeuser@???    joeuser@???

But the sendmail installation also supported a catch all address of

@one.domain        joeuser@???

I've tried both the aliasfile director with

query = [alias=${local_part}@${domain}],mail_aliases.org_dir:expansion

and the smartuser driver with

new_address = ${lookup nisplus* {[name=$local_part],mail_aliases.org_dir:expansion}\
{$value}fail}

And in both cases exim has errored with the message

"partial" is not permitted for lookup type "nisplus"

Is there anyway to handle the catch address with exim and nisplus? I
was planning on having to convert

@one.domain

to

*@one.domain

to match exim's partial syntax but can't even seem to get that far.

-- 
  Artificial Intelligence stands no chance against Natural Stupidity.
            GAT d- -p+(--) c++++ l++ u++ t- m--- W--- !v
                 b+++ e* s-/+ n-(?) h++ f+g+ w+++ y*