If you want two to one purchase you could just hang two bullet blocks from your chute clew. Then run your spinnaker sheets like normal and put them threw the blocks with a stopper knot so that there is a tail. You need to attach a camcleat close to your rear spinnaker block. Then after you jibe just reach up and grab the tail and put it threw the camcleat. I only recommend this for long distance races where you are going to be on one tack for a long time.

For triangles you can try two Harken Rachamatics. It seems to work well for me but others have different experences.

Mike Hill
H20 #907