Segment(io) doesn't have a solution for this, in case you decide to go searching. And their server side APIs have plenty of issues of their own (eg no way to get utm parameters to the destination - hugely frustrating and we are still working with them on that).
Thanks for the info. When I first heard about their product, I got excited that they were trying to solve this issue, but after reading their marketing materials and documentation decided that it didn't work how I expected, but I wasn't sure.
