How to patch SoftwareSerial library to works at 10400 baud?

Hi guys,
I need to use SoftwareSerial library at 10400 baud on my Arduino Nano V3... is it possible? How can I patch/modify the source code?

Looking at the SoftwareSerial reference it says...

On Arduino or Genuino 101 the current maximum RX speed is 57600bps

so I don't think it's going to be possible.

Not knowing how you want to use things but another option might be the Sparkfun ProMicro (or clone) as it has USB serial for talking to the PC but also has a hardware USART port so you can also do TTL level serial at the same time.