The spi/screacher would be furled for upwind sailing. Maybe its foot could be attached to a forward bridle instead of more complex pole?
A screacher puts alot higher loads on the components like mast and bows. It is basically an oversized jib and needs comparable luff tension to work well. A furling asymmetric spinnaker could be possible though.
Personally I think the bridle+pole is the simpler solution then any pole-less bridle arrangement as seen on for example the Swell Shadow. Also choosing either makes a HUGE difference in the max attainable spi area. It can easily make the difference between a 8.5 sq. mtr spi and a 5.0 sq. mtr spi.
The simplest solution will however be a symmetic spinnaker (no pole or bridles) and that one can easily be a mast top spinnaker as well due to the very low loads associated with it.
Wouter
