[exim] EXIM and message checking

I've got installed on a Centos 7 box, EXIM, Spamassassin, Clamav, Kaspersky AV
for Maiil Server and home-grown scripts.

My home grown scripts are the last to be called using the following

    deny    set acl_m0 = 
cmdline:/etc/exim/bin/virus_sweep %s:ThreatName:'(.*?)'
            malware    = *
            set acl_c_SPAM = 1
            message    = This message contains a virus ($malware_name).

in acl_check_data. This is after Clamav and Kaspersky but currently before
Spamassassin.

Kasp adds and modifies headers in the email as it processes it, but when I see
the message in my script, the Kasp content is not visible.

One example is that it updates the status to include one or more of [SPAM]
[MASSMAIL] [CURED].

However, the subject line that my script always sees is the original one.

I'm guessing that this is the desired behaviour. Is there any way I can change
this, and have access to the updated value?7