I am afraid, that at this stage manually adding headers to the exported pages would not be possible.
As you have noticed, other developers are also interested in the discussed functionality. Therefore, I would suggest you to cast your vote for the feature request in the Kendo Feedback portal
. Based on the support it receives from the community, we will decide on whether to proceed with its implementation or not.
Note, that our roadmap and priorities depend largely on the business value and customer demand for specific components and features. However, I would like to present you an offering that may be relevant and applicable to your needs - our Feature Acceleration program. It allows a customer to negotiate a certain component or functionality to be implemented on demand or sooner than our roadmap implies. Feature acceleration fits well in scenarios where a feature or enhancement is important for an application's success, but it is not planned to be available at the time of the application's completion.
Let me know if you are interested in pursuing this option at any time and I will put you in touch with our Professional Services team
to discuss your exact specifications and possible timeframes.