To activate Eraser and keep current brush just long-press Eraser icon.
You can also customize top toolbar, and add "Erase Blending" option.
I was asking if there was a way to change to eraser to where one does not have to reach up to change. Other apps have ways to toggle between the two without the user needing to reach across to the other side of the screen. Whether it’s placing it in the same location as where one’s sliders are, swipe gesture, hold with finger while drawing, or w/e. I was asking if there is such a way to swap. Currently the only way is to have a specific eraser in your favorites and drag the box near the size/opacity sliders.
Kind of like how you have the 4 finger tap to access otherwise cumbersome tasks to repeatedly have to reach for such as a specific filter or a layer function. I hope this makes more sense.
Generally the things you want to be immediately and most quickly accessible are Brush size/Opacity, Eyedropper, and Brush/eraser.