If you wait some days till dmm will release 3.2.0 versions for all dmm-boxes, you can use the new partnerbox plugin which allows to insert external URL into the usual channel list, and you can handle the streams the same way if they would come from the internal tuner!
I´ve already checked this! And it works great, for streams coming from a remote dreambox or a IPTV multicast stream which proxy-ed with udpxy...
Nice feature. Many people want this. But i assume that partnerbox plugin only works with dreambox hardware?