If Matt's offering to make a chute for $75 I would go for it. It takes a lot of time to build a plug, then a mould, then the chute. Being such a tight curve I found it not that easy to separate the plug from the mould and then the chute from the mould.

The drawing at the bottom of the picture is the cross-section. It also needs a substantial lip built up near the edge to keep the sock on.