[Exim] libClamAV and local_scan()

Though I believe virus scanning belongs on the client workstation rather
than the server, I'm being pressured to implement some form of antivirus
on the mail system I maintain :( I'd like to use libClamAV via Exim's
local_scan() function. Before I start work on this, has anyone already
put any effort into this goal?

Yes, I'm aware of MailScanner and exiscan - no, I don't want to use them.