It is not that difficult. The only issue is transmission line stub length.
Use current mode low voltage differential signaling to keep the power down with a termination at either end of the transmission line. Then every transmitter in the middle sees the transmission line impedance divided by 2 because it is driving two transmission line in parallel. The transmitters at the ends see the same transmission line impedance divided by 2 because they are driving a transmission line and an immediately adjacent termination although the termination may be placed remotely.
Receivers are high impedance just like on the old Ethernet 10Base-2 standard.
If the minimum stub length is too long for the baud rate because of integrated circuit packaging and layout, then use the same trick Tektronix used on fast oscilloscopes by using 4 pins instead of 2 pins and route the transmission line on and off of the integrated circuit so the stub length is only on the integrated circuit.