Perhaps not necessary, but I figured out how to get rid of the tuplet brackets by going to engrave/engraving options/tuplets/design/line width and setting the line width to zero. I tried filtering for the tuplets and hoped to do it that way, but must have been missing something.
it strikes me as easier to filter tuplets and set the Bracket Property accordingly (in the Properties panel).
Trouble is, setting the line width to zero hides the brackets for all tuplets, also the ones for which you need the brackets. Filtering for tuplets and changing the settings in the properties panel is the way to go. Theoretically, you might even be able to make a script to do this for you. What happened when you filtered for tuplets?