You could look at socat to create virtual serial ports and insert your byte reversal in there. Or there are things like ttymux (of various flavours() that can p

You could look at socat to create virtual serial ports and insert your byte reversal in there. Or there are things like ttymux (of various flavours() that can probably be adapted. [0] https://stackoverflow.com/questions/52187/virtual-serial-port-for-linux [1] https://hackaday.com/2022/05/03/linux-fu-the-infinite-serial-port/