Allow players to swap their current subplot for a new one (at x5) on any move.
Sometimes the events in play dramatically change a character's goals and priorities.
Sometimes the character's old priorities (their subplot) don't matter any more.
This means that it's possible for a player to get stuck with a subplot that it would not make sense for them to play.
A player should have the option of replacing their subplot with a new one (at the starting x5 value) whenever they make a move. This would allow players to represent changes in their character's priorities in the fiction and and obviate the risk of a player being stuck with a subplot that makes no sense.

This is is in Gamma!
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Josh commented
Awesome, thanks.