The GPIO would probably work but what if it is in a high state and the reset is driven low by another source? I suggest a low VF diode for isolation. This will form the 'or' function driving the reset. You can also use a MOSFET as a diode if you like. At the lower current the forward drop of a diode will be less.
Shockley diodes will normally have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from the internet): As the current rating goes up so will the size.
DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)
Hopefully this helps.