If you have a hard time getting lawyers interested in the case maby you should tone down the fact that the matter involves Bitcoins in the first contact with the lawyers and rather mention weexchange just as a payment processor, possibly even point at the high amount of USD(equivalent) that is at stake to get them interested first.
 
Im sure there must be lawyers in the usa that is interested in helping clients on cases involving 100 000's or even millions of USD if seen over all clients in possible groupcase(weechange balanceholders & Ukyo loan) vs Ukyo/weexchange, there is several thousend btc's involved, 2000 btc(2 million usd @ 1000 usd/BTC, where we probably in the near future will be back at again) in ukyo loan alone for example, in case things cant be settled in a better way before.

SOSLOVE868 maby you can ask MSantori https://bitcointalk.org/index.php?action=profile;u=118100 here on the forum, he is a us lawyer, so maby even if he may not be able to take your case he may know lawyers that is open to taking on bitcoincases, he seems to be logging into the forum quite ofthen  last logged in March 07, 2014. but he's not posing anymore, last post October 25, 2013, thats a bit strange, maby he's already involved in some high profile case in the bitcoinworld, possibly even ukyo's, in that case you may have to take his posible advises in the matter with a grain of salt if it's possible he reppresents the opposite part.

Hopefully this weexchange/ukyo loan  matter can be solved without it having to go to court thou.