Hi @SCA LLC,
Sorry for the delay in getting back to you.
As per all the details you've shared, I understand you’re looking for a way to export Print Booklet output directly to PDF instead of relying on the current PostScript and Distiller workflow. At this time, InDesign does not offer a direct PDF export option from the Print Booklet feature, and this is a known product limitation rather than an issue with your document or workflow.
I understand that this functionality is important to you, and I apologize for its unavailability at this time. Would you mind upvoting the following UserVoice request and adding your comments there? Doing so helps our product team better understand the demand for this enhancement and allows you to receive updates if there is any progress on the request:
https://indesign.uservoice.com/forums/601021-adobe-indesign-feature-requests/suggestions/33242137-export-pdf-booklet
Let us know if you have any questions or updates. We'd be happy to help further.
Abhishek