Planning to overtrain is a bad strategy. The low volume plans use higher intensity to compensate for lower volume. If you only have 4 weeks to do base training and have more hours available than the LV plans then a better approach would be to do the first 4 weeks of MV plan instead.
Also not clear why you are trying to cut short the base period which is arguably the most critical block as without a good base you are trying to build with inadequate foundations. You would be better off doing a full Base and Build and then skipping or cutting short the Specialty phase.