For me a double top needs at least 3 bars down and then 3
bars back up,,, on any time frame.
Your idea is tradeable should this pair reverse before it hits
the trend line and selling the collapse of this candle would
catch that move. I would be more inclined to wait and sell
the point of the big arrow on your chart where resistance
is greater. But, as I say, your idea would possibly catch
an early reversal.