PDF Accessibility - automation solution

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PDF

Adobe

Am working on a PDF accessibility process which consists of following steps:
- MS Word 2010 to tagged PDF conversion
- Touch most sections of PDF like headers & footer (because these are artefacts) to make it active and readable
- Add ALT text for special Symbols so that it is read out
- Handle few blank page scenarios inserted due to section breaks
- Table of contents handling like making leader not readable
- Removing empty tags
- Reading order fixes

Basically all of these are achieved through manual effort and remediation steps, as at times the PDF document pages runs into more than 100+; and the manual effort is time consuming plus expensive am in look out for possible solution, thinking about if these could be automated (all or any of these steps) with either coding effort or scripting solution if any
Any help and direction in this regards are greatly appreciated.
Thanks in advance!