I think you're giving too much emphasis on it. It's not that of a big deal since it's not escrowed. In the end this is just a desktop client to do what OTC or bitmarket.eu are already doing.
Both of those are centralised. Escrow facility is important too though
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Maybe try to have something more like RipplePay model instead of escrow? Automated and trusted peers?
Of course, you'd need a critical mass before it becomes viable.
Or rather, is it possible to piggyback off of RipplePay anyway?