Custom made support will probably always be the best solution. I agree that the two layer brim could probably be and good alternativ. But as it is now not possible in Cura.
When I have a print that has a critical spot eg. a sharp point or the edge of a square. I have a circular template I put on the model to strength that spot whiteout doing custom support for the whole thing. I know it's not and option for a big complex model but for three or four critical points it works fine. don't know if this cued help you.
That was what I was afraid of but had to verify ... oh well, life goes on.
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