I would start with shells (if possible) and even take out the small radii at first. Then see what the stress in your model looks like. These radii probably don't cause any stress concentrations at all, due to the overall shape of your part. If one of these small radii does show a high stress you may be forced to use solid elements, because -as you showed in your first post- the thickness may be too thick to get good results with shells. In that case it may be possible to model only a detail of your part with solids, and apply known displacements or forces at the boundaries.
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