I suspect even an additional band around the flange would help reinforce it, but it looks like additional material on the entire casting.
I'll admit I'm not convinced about Wow's justification for moving the spokes. There may be more metal there to take the strain, but it doesn't look like there's a lot more actually directly between the spoke hole and the edge of the flange, along the line which the force will be acting.
I suspect working out how a shape like this is effected by the various stresses and strains imposed upon it, is largely beyond looking at it and deciding what is happening, and probably requires some fairly hairy computer modelling to get a definitive answer.
It may just be that reorienting the spokes does place less stress on a weakened location, but I'd hate to have to justify this rigorously.
Time to wait and see if this works or not. Hopefully it's a more permanent solution.