Greed says no to that but instead make it here for the windfall. Greed is good. I think Trump can come up with a tax incentive for upstarts to build high tech state of the art factories in the USA behind a 20% tariffs. Not a hard sell.
In order for a 20% tariff to represent a guaranteed 20% profit then your scenario requires that the U.S. manufacturer be able to manufacture the item for exactly the same cost as manufacturing overseas and shipping here. If they could do that then why wouldn't they be manufacturing them here to begin with?