Hello,
1. No, it is impossible.
2. No way to pair without any user action on device.
3. Absolutely correect as it has no OPP profile.
There is no miracle. If device has no OBEX (OPP or FTP) frofile you can not sen dany file to it by Bluetooth (with or without WCL). However you may try to implement Blackberry protocol. Bu there are much more security in addition to PIN. To prevent your question: WCL will never include BB protocol as it is out of our interests.
Pairing. by default BB has BT turned off. Even user turn it on the BB has no one service running and it may not be possible to pair. Only when user starts receiving you can pair and send.