It looks like you have no better choice, mate, since the money locked up int the account is quite huge. I am afraid you are going to have to send them a photo of your passport plus other personal details if there's any chance that you will get back your money.
Yes, I agree with JeromeTash, there's no better choice then sending them your phone and your passport details because they're asking that as excuse to show they want to complete KYC and that's what you should do OP.
I hope they will release that money, or this scammer will ask another documents from OP or will give another reasons not to accept your submitted docs thus hostaging OP's funds is there very motif.