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I appreciate every precious minute of your valued time you had spent so far helping my project and I do hope it will be of use to others -- further details are on me -- your roadmap is the spark I needed to dig in .... MUCH APPRECIATED ...

Would that require changes to core components ?

For heavens sake NO! Never touch the Ossn core.

Read the component developing related docs and have a look into the OssnUser.php class instead. The end of the addUser() method is triggering a callback that would pass the user guid of the just created new member.

Your task is to develop a component which is registering a corresponding callback like

ossn_register_callback('user', 'created', 'group_autojoining_function');

and the group_autojoining_function which would loop through the available groups and add the member.

So far for a brief roadmap. Please understand that i don't have the time to go into further details.

Would that require changes to core components ??? Or is that doable within the bounds of the OSSN component system ??? I am up for the challenge - I am a DB system designer by trade (financial systems)

Of course there would be a way:
Study the database and find out which relations are making a user a member of a group and add the necessary code to the registration process.