Migration from existing platform to HippoCMS

[Geane]

Currently we are using Documentum as our Web Content Management System (WCMS) with some of the tailored functions. As the expiration of support, we are now carrying out a feasibilty study to look for the possibility of migrating to other open source CMS.

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Hosted Web Site:
~50 Sites
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Functions involved:
1. Upload of SELF-DEVELOPED websites (files including: html / htm + css, js, jpg, png etc) [Mainly html files]

2. Workflow for controlling the publish of uploaded files of SELF-DEVELOPED websites to staging or production server
(i.e. Uploaded file (status: WIP [Work in progress]) -> Start Approval Workflow (status: Staging, uploaded to staging server for preview) -> Approved by reviewer (status: Approve & Active, publish to production server for viewing by public users)
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I have been looking for many different forums. It seems that only the website created by Hippo (but NOT SELF-DEVELOPED websites) could be put on the workflow for further publishing. Could any forum members and professional give me some hints if my said functions could be done with Hippo?

Thanks!!!