Can a single invoice be sent to multiple email addresses?

Can a single invoice be sent to multiple email addresses?

I have a customer who normally receives his invoices by email, but his wife would also like to receive a copy to her email.

I typically create invoices by importing them from a csv or excel file.

When I email the invoices, I send them in bulk (25 at a time).

I realize that when I am emailing a single customer (not using the bulk send feature) I can input an additional email address into the cc field.

When sending in bulk there is no obvious way to do this.

I can add another contact to a customer's profile, but then when I send in bulk, the invoice does not ALSO get forwarded to that contact.

What is the best way to accomplish what I am trying to do?

Thank you for your time.