I think I've worked it out now. When I want to change magnification instead of changing eyepieces I'll change the telescope and keep using the Nagler! I only need one eyepiece then.
You would appreciate good barlows with the Nagler. I just got an Antares 1.6x 2" and it's fantastic, as good as the UO 2" 2x barlow (also tops). With these two barlows + 19mm Panoptic, I have at least three premium EPs.