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I may be able to cut down the pedalboard slightly, but then I may have things overhanging, or not enough space between pedals to fit the cabling.

There is one other possibility. The Travelpro FlightCrew5 Vertical Rolling Overnighter. This is a similar size to the Platinum Elite Regional, but slightly thicker, 8.5" overall, which means it's technically a little too large, but probably won't get flagged for gate check.

Listed Dimensions: 16" x 14" x 8"
Outer Dimensions: 17h x 14w x 8.5d