Tasker app creation: is it possible to let user select the apps for launch app context
One way to do this would be to create a scene with a small menu of apps, set to open the app when the user taps it's icon. 

One issue: Errors might arise if you have Tasker try to open an app that the user does not have installed. One way around this would be to use the shell command 'pm list packages' and (somehow) resolve the name of the chosen app to the package name, or the reverse and use this to populate the displayed list.