Juggernaut on shared fastcgi hosting

I am in the process of developing a flex/rails chat application that
will be hosted on a shared hosting account. I do not have shell access
and am wondering if there is a workaround for having to run
script/push_server. Is it possible to setup the push server as a
seperate app or cgi process? To be honest I would rather use Activemq
and Activemessaging but Activemq is not available. Any suggestions?