I wouldn't suggest you to experiment with the dongles unless you are ready to take risks of paying for a dongle which can't be switched into UART mode. The other thing is re-programming the module. There;s PSKeys application available for Linux. I wrote some lazy windoze piece to do that too, and I can put its source code on my website. But other than that, I'm not gonna help with it. If you are thinking of re-programming the CSR module, all necessary documentation is available on CSR support website.
I spoke with someone who said they still can order the old revision of the Billionton's dongle. If you want to contact them directly, here's the email: sales@boteq.com. They have a presense on Ebay too. Make sure to request an old revision of the dongle as showed on the pictures on my page.
-albertr