analog output redundancy

I am using control logix 1756-OF8 analog output module for my application. I need to connect 2 analog output channels to a single field equipment(I/P converter) . Is there any external device to handle both channels(4-20 mA) and give one channel 4-20 mA output.

Use a signal relay?

Just wire it so there is some load on the non-active output.