Papa Johns may soon be headed for another major ownership shakeup after the company’s largest U.S. franchisee reportedly joined forces with investment firm Irth Capital in a renewed push to take the pizza giant private. The proposed deal, valued at roughly $1.5 billion, adds new momentum to a months-long effort to buy out the company as it faces slowing sales, rising costs, and mounting pressure across the fast-food industry. According to Reuters , at the center of the talks is Nadeem Bajwa, head of the Bajco Group, which operates nearly 300 Papa Johns restaurants and controls about 10% of the chain’s domestic locations. Bajwa is reportedly preparing to make a “significant investment” alongside Irth Capital, one of Papa Johns’ top shareholders. Sources familiar with the discussions said company leadership and board members were recently informed of Bajwa’s involvement. The proposed offer is reportedly valued at around $47 per share, a major premium over the stock’s recent trading price.…