I'd created a demo panel by configurator which can put a list of your favorite brush and switch them quickly.
Left is an image widget, picture is clip from screen shot of brush manager.
Right is a script button with script code like these:
var V1 = new ActionDescriptor();
var V2 = new ActionReference();
V2.putName(charIDToTypeID("Brsh"), "Soft Round");
executeAction(charIDToTypeID("slct"), V1, DialogModes.NO);