I think that's a pretty good plan. For a pond your size, I'd consider getting a shock boat in there this Spring, before they spawn. No matter what the DNA testing shows.
Since they hammered your forage base already, I don't think angling will remove enough of them to let your forage base rebound quickly. If a lot aren't removed, even stocking more forage will just be stocking food for the bass, and a lot of your newly stocked fish won't survive to spawn.
Even e-shocking won't remove all of them, but if done at the correct time of the year, you should be able to remove the majority of them, allowing you to continue with your goals for the pond.
Angling just removes the LMB that will bite, leaving the hook smart fish in the pond. The e-shock boat doesn't give the LMB that choice. If they are within the electric current field, they are stunned and can be netted out of the pond.