Customising blank page after part title page

Hello all.

Is there a (more or less simple) way to customise the blank page that is inserted after the titlepage when generating FO output? In my customisation layer I have tried with different template names: page.titlepage.before.blank, lot.titlepage.before.recto etc. But nothing makes it into the final FO file. Is the only option to customise page masters?

Thank you.
/frank