Unfortunately, as I tend to agree with Clem, the only remedy would be a two-level penalty tier. I have little confidence that refs could adequately officiate this when there is even more judgement involved. But you're right Pit, it would be just as bad if a defender could trip a WR inline to an easy TD for only a 15 yard penalty.
I've said it for years, PI is (has been) ruining the game, receivers are becoming very well-schooled at "inciting" PI. Flailing, initiating contact, slowing to create contact, etc. Reviewing these plays should give officials the ability to call a "flop" as they do in the NBA, but at that point enforcement would become very convoluted.
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