Thanks M_C, having a toolchanger does rather change the game! Your advice to not overthink it is noted. It was my concern that things are more complex than I thought that made me post.

Why on the one hand do savvy builders on this forum appear to have no interest in a tool sensor that can save them so much time when it can be as simple as a £6 panel switch yet the market supports solutions at £50-100 and Shapeoko hobbyists go mad for the benefits and pay £120?