As we discussed at the Live Q&A on March 10th some broad-leafed evergreens are suitable for defoliation, and the question was asked about an evergreen Oak.
I have researched a bit, lacking the full potential knowledge on exactly that species and found that suitable Oak species to defoliate are Holm oak (Quercus ilex) and positively also defoliate Cork Oak (Quercus suber). Done during the active growing season. Best in the warmer and late part of spring and in summer. This leads to other evergreen oaks probably will react positively on defoliation (no guarantees though).
That will lead to a better ramifications when needed.