Not sure if this helps, but my approach to time warp in the feywild is to use localized bubbles rather than a pervasive, planar effect. Some bubbles go fast, some go slow. They pop up and disappear randomly, so they can't be mapped. The strength of the time warp is stronger toward the center than the rim, so you won't realize when you've entered one; for instance, the guy walking 30 feet ahead of you won't suddenly start moving 7x faster once he crosses the threshold of a day-to-week bubble.

Feywild natives can sense them, and avoid or exploit them accordingly. Outsiders better find a guide they can trust (ha!)

I think this would solve your logistics problem, but if you need a pervasive, planar effect for other purposes, this clearly won't work.

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