The single line method really works nice - I'm going to stick with that. The lines aren't hanging up in the blocks or anything, what was happening was when I tossed the halyard off the boat it immediately tied itself into the world's biggest and worst knot being dragged through the water. We'd then have to bring it back on board and clear it before the spin could come down. The line is 1/4" Yale light, which is normally kind of tangle resistant, and there's probably about 15-18 feet of it when the spin's up. Now we're very carefully coiling it and paying it off the boat very carefully. This helps, but I hate the time and care it takes. Your 1 to 2 halyard sounds interesting, maybe there's something there that can help reduce the amount of line as well.
The idea of something just sucking it up whilst the sail is raised is particularly enticing. I'll have to check with Greg. Of course, being a tinkerer I'll probably be looking around the pet store this weekend...