Convert/join multiple file formats (doc, pdf, text) into 1 single PDF/A using web services

We would like to purchase LiveCycle for the PDF Generator feature, but we want to know if it will meet our technical requirements.

We would like to convert a PDF, an HTML, a DOCX, and some custom text into 1 single PDF/A. Basically: joining 3 different files types and some text into 1 very long PDF/A file. Can we do this type of join?

Also, we would like to install LiveCycle on a central server and then call a web service or use an API where we can input the 3 different files and the text and as output we would get 1 PDF/A back. Obviously there might be intermediary steps, but in essence we need to be able to do this conversion from our custom code by calling some LiveCycle API.

Thanks!