You are asking for things that are very difficult to satisfy. If you want to sail deep downwind angles, you should have a spinaker; if you want to sail single/shorthanded - use a spinnaker sock for hoist/takedown. If on the other hand a simplicity is in favor, then use an asymetric. Although not capable of sailing such low angles as sym. spi. it is much easier to hoist and trim, especially when equipped with a sock.