Building or purchasing a 10kV flyback transformer that operates on 2 watts or less is theoretically possible, especially at lower frequencies. The transformer must effectively charge the stray capacitance each cycle to function correctly. For a DC output, using rectifiers for each secondary winding layer could achieve the desired 10kV DC. However, practical implementation may present challenges that need to be addressed. Overall, while feasible, careful consideration of design and operating conditions is essential.