Push an av to a local vector

Okay, I am trying to make a fake skydiving "thing". Basically, I want to move an avatar to a location on command (not via sitting or attachment). I want to hold them there, and then randomly move them every so often to another location within, say, a 10m cube.

Can anyone help? I'm looking at llPushObject, but I want to apply a sustained force, so not sure if this will do it.

rex a phantom hollow cyllinder, move it to the avs position, make solid, then make it physical and use llMove to target....

assuming that converting it to solid and physical doesn't float the av out the top that should work =)