Rather than editing PDFs directly, might it be possible to use LibreOffice (LO) Writer? Write, with all the features/facilities of a document editor that will likely meet all your needs. When the document is complete, export as PDF and e-sign the PDF with LO as well..
LibreOffice is community driven and developed software project, not the product of an American company.
'Bates' numbering: LO Writer supports creating custom page numbering formats/styles.
e-sign: e-sign the PDF with LO as well, reference links below
Workflow
an example workflow might be:
- Create document templates, save read-only in network accesible location; only the template maintainer can edit/save the templates; law firm logo, letter head, watermarks, Bates numbering, etc.,
- Author copies desired template to author's system and makes the copy writable,
- Edits/saves drafts locally on author's system, or in a central, network accessible repository; backups, team access, preliminary/formal reviews, etc.
- When final version is complete, export as PDF, and of course, save it as well
- e-sign PDF using LO
References
https://knowledge.digicert.com/tutorials/sign-openoffice-libreoffice-documents https://duckduckgo.com/?q=libreoffice+pdf+esign&t=vivaldim&ia=web