Hi Brevity ,
As I told you in my last post that would need custom development. Our support scope doesn't include custom coding. I'm sorry.
It's what I included the second option:
Hire a good developer to assist you in making the new plugin compatible with ATUM
You can also try contacting the developers behind ATUM to assist you, but only externally through their development agency (BE REBEL).
If interested, please create a project at Codeable and assign it to them through this link.
Best Regards,
José Andrés