The ultimate goal of the reforms is to increase broadcast rights for the competition to satisfy cash-hungry leading European clubs and end the threat of a breakaway Super League.
The tournament is organised by the 33-year-old's family with his younger brother Djordje acting as director, and will be played in his "Novak" facility where he regularly trains.
Messi scored a spectacular goal that he started in his own half at La Cartuja before rounding off the victory with a strike into the corner for his 31st goal of the season.
It remains to be seen if his seventh Copa del Rey triumph is the last trophy Messi lifts in Barcelona colours but if this was to be a final flourish, the 33-year-old crafted a fitting farewell.