Finally got identi.ca messages showing on my blog again, since the switch to pump.io. The solution:
 - Use pump2rss to get an ATOM feed URL
 - Put a script in cron to wget that URL
 - Pipe the results through "xmllint --format --recover - 2> /dev/null" to fix dodgy markup
 - Pipe that through xsltproc to strip out the empty title elements
 - Pipe that through xsltproc again to turn content elements into title elements
 - Pipe that into a Web-accessible file
 - Point ocPortal's side_rss block at that file's URL