The potential for political fraud and mischief is not uniquely associated with either the current system or a national popular vote. In fact, the current system magnifies the incentive for fraud and mischief in closely divided battleground states because all of a state’s electoral votes are awarded to the candidate who receives a bare plurality of the votes in each state.
Under the current system, the national outcome can be affected by mischief in one of the closely divided battleground states. It only took 537 popular votes in Florida to decide the national electoral college winner in 2000.
The current system restricts fraud to the state/district level instead of magnifying it on a national scale.
Yours is a lousy idea, and you should peddle your self-interest elsewhere.