4.7 Upgrade help please

was using this module in 4.6.6 - though I had modified it and the database table in order to EMBED the custom CSS per node rather than importing a whole new style sheet.

It's not working in 4.7 and I would appreciate any help in updating it, I don't know enough Drupal to re-write the module myself but I will happily show how I "tweaked" it if that helps anyone

Info on differences I see from 4.6 to 4.7 (in English as I don't understand the hooks yet):
1. It's still importing the CSS styles that are already in database (from 4.6)
2. It's still present in modules and access control
3. It's not showing up in settings >> content type >> config (set which node types are allowed to have custom CSS)
4. There is no textarea in the node/add forms to input the CSS info to database

As an added feature request if it could be be made to either import an external stylesheet (per node ID as it is set up to do) OR embed styles input into a textarea (choice by checkbox?) that would be a bonus though not critical

any pointers welcome as to where to start looking..
Thx, Suzy