Not sure what I want to do is even possible but here is the overview.
Ideally I want a Plesk server to Forward ftp requests to a cPanel server. It would make my life easier as some old legacy hardware ftp's into a Plesk server based on IP address and would prefer not to have to push an update to these old devices. I have a feeling this is not possible which is why I'll likely have to go with my second option.
A second option would be to have the cPanel server ftp to the Plesk server and grab the legacy files. I could periodically set this up... suppose through a cronjob or something like that.
Or if anyone has another idea of how to achieve this that would be great.