SOMA is getting ready to make a Mixte. Won't be custom, but might work for you.
pardes-
Another option for you would be a Bike Friday - if you search on here, you'll see some issues I had when I got mine. But, the company has (at least so far) stood behind the product and I've talked to enough people to believe that my issues weren't typical. Due to their design, they are much easier to get your leg over. My bike is the Crusoe, set up with a generator hub and 28c tires. DH does fast club rides with his, but it's capable of loaded touring as well. Others have the Pocket Rocket/Pro - they're designed more as true road bikes. Most of their models are custom.
CA
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