I don't know such projects, but I can say that a project based in old Interlude revisions, 1100~, will have a hard time, it's outdated, bugged, incomplete, and would require lots of work to get it to a nice stable version.
The best you can do is take clean Freya server and "downgrade" it to meet Interlude.
Refactoring Interlude with Freya/High Five code is fine, but is harder and may take lot of time to clean/refactor all the bad/outdated code in Interlude.
--Edit
Does any of this project ported Java Quest engine to Interlude?