Thank you and I believe I do understand the scenario. Although, at this time using the Page Header is the only way to produce frozen rows when exporting to Excel. However, using an expression binding for the Visibility property to alter a Textboxes in the Page Header might also be used. See the Bindings documentation for more details.
Additionally, we have an existing Feedback Item that is approved and tentatively scheduled for the R1 2020 release. This would involve using the Report Viewer to freeze the rows which might work in your scenario as well.
Lastly, as a token of gratitude for your feedback, I have increased the priority of the Feedback Item by casting a vote for you. I encourage following it to receive status updates.
I hope this helps. Please let me know if you need any additional information. Thank you.
Eric R | Technical Support Engineer
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