SBUS2 merge Tx sensor data

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I want an accellerometer to function as the vario on a Futaba T-FHSS SBUS2 system. Sadly Futaba does not sell these sensors so I had to build my own.
First task at hand was to recognise the spot where the sensor data needs to be fed into the SBUS2 and send two sets of three bytes. That is where I am now. When I use the same logic analyser settings to read the SBUS2 data for reading the Tx output I can read the bytes I want to send.

Both signals are 95000 BAUD 1 Start, No parity, 1 Stop and Inverted
When the SBUS2 is sending the Tx is low
When the Tx is sending the SBUS2 is low

All there is left is to merge both serials by hardware. When I connect the Tx to the SBUS2 it pulls the SBUS2 down and it stops working.

What is the proper way to connect the hardware for adding the Tx to the SBUS2

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