Another way is to pull tension on the forestay wire and tension the luff before stepping the mast.
I think that's the only way you can do it on the Getaway the way it is.
However, the forestay is long enough (or the jib luff is short enough depending on how you see it) for there to be a couple fiddle blocks for a simple cascade of 4 or 5:1. If you put the cascade at the bottom, though, you will raise the tack and clew so the sheeting points may be off (and you may mess up the boat balance since you move the jib coe aft). You could put the cascade at the top and have a very long line go through the luff pocket to a cleat at the tack; then nothing gets messed up but you will get more turbulence from the hardware. I was just enquiring if any Getaway owners have done such things...I can't be the only tinkerer who owns a Getaway, right?