Pinstripe and pastel don't seem to have much effect on how much white a piebald has, they can be high or low white just like any other combo. I think you're thinking about spider piebalds, who do tend to have only head patterns.
Also you have to remember that getting piebalds is a going to be a multi generation endeavor since piebald is recessive (pied + whatever = 100% het pieds).
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