Sharepoint Subscription using one RDL report for the email and second report as a PDF attachment

I have a DDS set up in SharePoint to render a report as the body of the email. I need to attach a second report as a pdf file. For internal customers, I just added a link and they can dynamically create the second report that renders as a pdf.

Here is my problem.

For external customers, they do not have access to the SharePoint site. So I need to set up ONE subscription to have one report as the body of the email and the second report a PDF attachment.  Customer does not want to separate emails. 

I thought about one report but is there a way to create a DDS with two different rendering types (mhtml and pdf)?

Any ideas or different approaches would be greatly appreciated?  Not too familiar with SSIS... could that be an option?