If the only requirement is to run SSRS reports, the operational databases shouldn't be used and the data can be one day old, I would report off a restored backup of the OLTP servers. This seems to me the fastest way to get you going. I personally find SSRS difficult to use against MDX sources, but this isn't a problem with OLTP and standard T-SQL.

If a true BI solution were ever desired, however, this method hasn't taken any steps in that direction.