I've never seen such a price action. Therefore, due to the fact this seems like a big issue for you...
Please post a chart example of such that includes the name of the trading instrument, date and time frame because these types of discussions without any chart examples...they quickly go someplace you really didn't want to go especially when you start to talk about trade strategy.
Your own words from below involving your opening statement implies that that you know that chop comes from somewhere (there was a type of price action before the chop showed up) when you said price goes sideways. That somewhere can only be trend or range. As I stated earlier...there's a flow to price action movement (trend, range, chop). Simply, they are always connected unless we're talking about the first price actions of an IPO and that price action decides to be chop. Thus, the chop came from no other price action (trend or range) in reference to an IPO trading for the first time.
Once again, please post a chart example with name of trading instrument, date and time frame of what you're talking about that you refer to as "pure chop" that didn't occur within a trend or range.