Beautiful work, Alexis!
Those small supports should minimise resin waste.Does this photo answer your question?( i am not sure i understood what you mean)
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Blender can do it and it is freeis there any way to increase the thickness?
Which tool in Blender?Blender can do it and it is free
Can you choose inside or outside adjustment, or is that 'offset' in either plus or minus direction?In blender:
modelling->object mode->Select object->add modifyer->choose solidify->adjust thickness->click check icon on the solidify line next to the camera->click apply
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