I'm the CEO of BlockSimple Solutions. We have experience building on multiple blockchains for both large and small clients.
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We had a similar issue.
Assuming all 3 co-founders are American citizens I can think of two banks: Everbank and BofI. If your co-founders are merely living in America but not citizens, BofI is out. Everbank however will still allow you to bank with them but you might have to jump through some hoops.
In our case we have people worldwide. We still don't know a good answer to that question.