Packaged Install to replace Facebook Group

I'm not sure if this is the right place to post this, and if its not please delete/move as needed.

What I'm looking for is someone to help me develop a backdrop package that would have all the functionality of a facebook group.

The minimum requirements would be:

• Static Pages
• Blog, written by a Writer->Admin usergroup
• User Generated Events, with ICS download links
• Calendar views on user profiles where a user can see the events that profile created.
• moderated discussion on events, and blog
• Small moderated forum for group discussion
• Invite links for registration

The events, forum, etc should be configurable so that only registered members can see them.

A nice-to-have would be:

• Personalized .ical subscribe links that can include events of specific tags, users, etc. These links could be revoked by the administrator if their is any funny business
• Automatic syndication of posts, events, etc to corporate and federated social media platforms (Facebook, Threads, Bluesky, Mastodon, Linkedin, etc)

I have tried to put something like this together myself, but have had zero success. 

I would like to be able to offer this as a self-hostable solution to groups and companies that are interested in getting off Facebook and other corporate social media

 I have no budget in mind, and at this stage curious about the "order-of-magnitude" cost/effort that putting something like this together. 

If you have any feature questions, comments, or if this is something that already exists, let me know.

Cheers.