I know you don't want to use copper with finished beer. I'd stay away from copper with finished cider, as well.
Why not bottle the cider when it's where you like it, and pasteurize in the bottle following the sticky in the top of this forum? That would work, wouldn't require equipment, siphoning, pumping, etc. and it would work.
Broken Leg Brewery
Giving beer a leg to stand on since 2006