Actually there are plenty of clean boost pedals that will accomplish this. However like any stomp box there are issues with tone-sucking when they're turned off and even if you avoid that problem with true bypass switching, you get popping or clicking when you engage them. It might not be worth it for just one feature, but the new LR Baggs Venue DI seems to fit the bill for you since they added a "one louder" stomp switch.
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