I only venture into the Windows world. I don't go outside it so to me responding to the ATBRD command seems simple and easy.
I have gotten around the issue by using an ethernet to serial adapter in "raw" mode. The devices appears to OBDSIM as a standard COM port but ignores the command to set the baudrate to 9600. I've told the device to stay at 115200. This way I can simulate how fast my car reader actually reads.