You should be able to happily run multiple sensors (in non-parasite mode) in parallel off three wires - shared 5V external on one wire, shared data on another (going to arduino) and shared GND which is tied between the 5V supply and the arduino. You'll still need a 4k7 ohm resistor at the start of the run between data and 5V.Is there a reason you want to isolate them?
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