You are correct with your three options:
1. Put back original stock
2. Apply for your E endorsement
3. Replace the pistol grip stock with a thumbhole stock.
Modifying the current stock so that there is a connecting bar between the stock and the pistol grip is unlikely to be accepted by the police and you will need a court ruling should you wish to go down that route. However I believe that in the Richard Lincoln vs Police case, the judge sided with the Police and ruled that a connecting bar was against the spirit of the law.
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