Hello Simon,
it is pretty hard to use such an indicator because the news is different every day. Yes, some are at the same time, but they are not really in line…
You can find an online script that closes all trades at the same time. Also, you can disable the EAs from MetaTrader.
I have done that a lot before but recently I am at fully algorithmic trading.
The problem with the spikes is that the brokers do not execute the trades so quickly. This is one of the reasons why I prefer M15 chart.