Hello Jai,
I don't think the SAP won't integrate the MDM with an own connector. It hasn't been on the roadmap for years.
Over the years I have connected the MDM in half a dozen projects with said connector (I wrote it back in 2008 
).
The MDM Java API is quite well documented: MDM Java API Library
For the IdM Java API (DSE.jar) I've written a blog how it's possible to use it: How to use custom classes in the SAP NetWeaver Identity Management
Years old but still valid today. It should work similar in 8.0, too (or at least I hope it does).
These are the basics for any Java based API connector.
I assume there are some more self written implementations out there which have done the same. Implementing such a connector now would take me about two weeks. Initially it cost me about two to three months, with already knowing the MDM Java API quite well.
BR
Dominik