Dashboard URL/XSLT dynamic link

I have a dashboard which I would like to dynamically build the URL/XSLT property. The Publisher (Dashboard query) does pass the SSRS URL into the URL/XSLT view to render the SSRS Report. Currently this is only ReportURL that is brought back from the BAQ query. BUT, I want to have this URL to also have several other fields such as [ReportType] and [CustID] that would be used in the SSRS report.

If I could build this URL dynamically, then simply pass it into the URL/XSLT view then that work.