Thank you! You gave me some ideas.
What I ended up doing is using a Betterly gauge designed for tablesaw and router use and modified it a bit. I used the tablesaw table for the flat reference and secured the Betterly setup so that the dial gauge was extended out around 8". Then I put the soundboard plate down and moved it around, keeping pressure on the board, close to the dial gauge pin.
I found out my concerns weren't warranted. The soundboard thicknesses were very consistent.
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