No, PB is not great for modifying schedules for most reasons, and “masters” type approach is included in that limitation.
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As a 46yo rider, and one that use to be OK with the default plan layout, lately I have only used the PB sparingly. I use to see if it can get something close to my needs. Often I don’t even implement the plan past the Review stage. But it can help me see a way to shape around some events.
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At this time, I am most often manually add each phase and then tweak to my altered schedules as below:
Other riders like to stretch the weeks to add more recovery between a more “standard” 3:1 type of schedule. They look at the “hard” workouts of the week and lean to more Polarized approach or other changes to workout spacing.
Here is a search list with some “Masters Plan” discussion that may be worth review: