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(But I'm not sure where you get the ±5 V limits from. The outputs of a RS-422 transmitter are between GND and 5 V (the differential bus voltage can be negative because it is measured between the two data lines), and if there are ground shifts in your system, the bus voltages might be larger than ±5 V.)
As Clemens suggested, we have various dual 2:1 switches compatible with your application, however I wanted to bring this new device to your attention. The TMUX2889 is a dual channel 2:1 MUX with +/-5V I/O signal capabilities, as well as a typical Ron of 0.16 Ohms. I believe this would be an excellent MUX for your application.
