> will be taking over maintainership of ecb.

Great news!

> prefer the current SourceForge Site or would consider moving to a Github site

Do please move the repository to github.

Out of curiosity...  IIRC Klaus' implementation made heavy use of advising many functions.  Since the time of that original implementation I believe that Martin Rudalics has made significant improvement to emacs' windowing mechanics, specifically with ECB-like UIs in mind.  Do you foresee evolving the implementation to use those new facilities?