Invite him to the White House, Pres. Trump.
It's time to provide a focus for the regime-change groups inside Iran and please do it without fanfare.
I suggest that Reza Pahlavi, the Iranian Crown Prince be invited to the White House, in order for the President to gain first-hand opinion on what a post-Ayatollah Iran might look like. The media story should take pains to ensure that the visit isn't taken to be an 'annointing' of Crown Prince Palavi, but exploratory only.
In Gaza President Trump outlined what a post-Hamas world might look like and he attempted something similar with Kim in the DPRK.
If there is a furious reaction to the Pahlavi move, then no harm done.