This same thing actually happened to me. We bought 3 10 foot lengths of chain length fencing tops and a bunch of twine. Taped all of the piping together at the seams. Ran the twine through the piping, tied a slip knot at the end, and loosely taped it to the pipe. Tied the jib halyard close to the end of the slip knot end of the piping and hoisted it up. Looped the run away halyard with the slip knot and lowered it all back down.
I'm sure the same thing could be done with almost any tubing. We chose the fence stuff because it was more rigid and bended less.
Cool thing is that we were able to return the fence topping, so it ended up basically free.
1971 Cal 25'