Can Adobe PDF merge two PDFs in either the natural order or alternating pages in reverse order?

You can do it in seconds using this (paid-for) script for Acrobat I've developed:

https://www.try67.com/tool/acrobat-combine-even-odd-pages-2018

This is possible with Adobe Acrobat and a script.

@ajo_144  Acrobat's basic merge function doesn't directly offer an "alternate pages" merge, you can achieve this through a combination of merging and page manipulation. But, you would use the "Organize Pages" tool to manually rearrange the pages, alternating between the original and translated pages. This can be time consuming for large documents.