I can't help in terms of DIY casting, but if you do get really stuck - I had a ring cast by Weston Beamor in Bham, and it too had a very narrow section between the shank and the stone setting. They were concerned that the neck would restrict the amount of metal that could flow through to the two end prongs of the setting (obviously also very small narrow parts).
They said they could make the neck wider on the mould so that the metal would flow properly, so we agreed they would do this. When I got the finished shank though, I could see that they hadn't done that, and it had worked fine in the end.
I know these things are always nicer achieved by oneself, but from your description and seeing other work WB has done, I would expect they could do it fairly easily - check out this piece on their
FAQs page.
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