The reason for a bread knife is the wavy or saw shaped teeth, so some of the "miracle" knives with similar edge profile might work too.
When selecting the foam, start with a quite firm texture and then go at least one level firmer. A soft foam might seem like the comfortable choice....until you hit a bump or go off road and your butt crushes the soft foam and impacts the metal pan below. Do that once and you'll be back at the upholstery bench remedying your "good" idea very quickly.
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