How about adding support for Matrix protocol in Escargot MSN Server? Matrix is an attempt to create modern standard IM protocol just like IRC and XMPP. With help of Matrix it would be possible to use many networks through bridges with MSN Messenger. Here is corresponding issue in Matrix wishlist: https://github.com/turt2live/matrix-wishlist/issues/158.
So far, no implementation has been done for it yet, but it can be looked into in the near future. In the meanwhile, you can watch for progress on support for the Yahoo! Messenger protocol, IRC, and a simple set of APIs that we plan to extend on after they’re released.