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.
Trapeze and spi halyard at the mast top would work, especially with a ram vang instead of a traveller.
A topmast asymetric would be big, but a bridle or shorter pole would bring the area back to normal.
The pole takes only longitudinal (compression) loads, while the bridles take the lateral ones. If the pole isn't longer than the bow, the effort in the bridles should be the same with or without pole.
