Syndicating comments on WordPress blogs – possible?

Hi there,
Our science blog network Sciblogs.co.nz is using WordPress MU to host 30 science blogs, around half of which are syndicated from independent science blogs, many of which are hosted on WordPress (some are on Blogger or Typepad too)

WordPress MU syndication via RSS to Sciblogs is working exceptionally well except for one thing – comments left on independent blogs cannot be syndicated to Sciblogs and vice versa. THis means that bloggers have to maintain two separate conversations – one at Sciblogs, one on their own blog.

Does anyone know whether there is a way to merge the comments so that the bloggers can maintain the conversation in one place and all the comments in the discussion are mirrored at both locations. If we can do this, comment traffic will be so much better.

Any plug-ins out there that handle this? Any comments, suggestions appreciated,

best regards

Peter Griffin