Creating a new transaction for this report writer generated report will only allow yo specify an initial variant, so you would require to add some code.
The report behind the transaction was generated from report writer, there is at least one provided customer exit for the generated program, GRWTAUTH to add some authority check.
Create a project and activate the exit. Perform some debug, look for a way to access field catalog/layout from this customer exit implementation, set some fields as technical so user wont be able to display them.
If successful don't forget to add a sy-tcode filter as this exit should be called from every report writer generated report. (you could define a BAdI with filter on sy-tcode in the exit include...)
