If you own Adobe Acrobat (the full version) you can do this. It’s not cheap though. Maybe you can get a limited or educational license for the program. Almost everyone knows someone who uses the full version to make PDFs.
Ask friends and family, you might be surprised who has the full version at their workplace.
in osx preview if you go to the sidebar where the pages are, right click the page and select copy. then go to file and click “new from clipboard” it creates a new file with just the part you have copied (in this case the page). then just save