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RS232 Tranceiver which can output LVCMOS 3V3 or RS232 Level
Unfortunately I'm not aware of a device with this feature integrated. The simplest solution I can think of would be to use an RS-232 transceiver that is capable of being disabled (with high-Z output) along with either an analog switch or a logic buffer (with disable feature) that could be used to route the DIN signals directly to the DOUT signals. When LVCMOS communication is needed, the RS-232 transceiver could be disabled and the switch/buffer could be enabled.
