TLDR: No. Too hard. Prone to bugs/problem.
Widgets are special. Flowx doesn’t have direct control of the widgets. Essentially, Flowx tells Android to show something in the widget and the Android OS runs their code to show the stuff. Also Flowx tells Android what to do if a user clicks on a widget. Widgets don’t have a double clock option. So the way around this is to detect a double click by checking if Android tries to open Flowx twice within a few hundred milliseconds.
Double tap on widgets is hard to do and prone to bugs/issues - as we know - so it probably not worth it.
Programming widgets suck. They break on different phones. Developers hate developing widgets.