Wordpress Multisite Frontend Publishing Submission Form

In future I want to use Wordpress Multisite to run multiple blogs. There should be a possibility to post frontend from the main page to all sub sites. Users can register on my website and select a membership to get access to the frontend post submission form. There they should be able to select the subsite (site1 site 2 site 3) and the category (categories of site 1, categories of site 2 etc.) of each subsite where the post should be published. The post should be published under their Name. I tried to realise it with the Plugin "Frontend Publishin Pro" but there I just can select the Categories of one site. The system must update on its own if a new site get created, so that members can post to this. Summery: 1.) Wordpress Multisite Installation (working) 2.) Users can register and select Membership for publishing posts (working) 3.) Users have ONE FORM (frontend) on the Main Site to submit posts trough the whole Netwerk (your Part) 4.) User can edit, delete and view their Posts through frontend Dashboard (your Work) 5.) User have a statistic (clicks etc.) (optional!) I have the Plugin "Frontend Publishing Pro". It would be nice, if there would be the possibility to get it work withi it.