For street photography of the quick brand, the best I have found is to wrist a digital meter very close to the right hand (if you write with your right hand), but with a very little distance freedom from the palm, in order to just let it drop after the exposure, and seize the camera.
The shorter the distance of the meter from the palm and fingers, the lesser the time to waist untill the reading. Let's not forget too that after the exposure we have to set the camera, and afterwards start framing :bang:
The meter never interferes with the camera, since the camera gripping starts with the palm hightening the camera, while the meter short wrist tends to go downwards at the same time by the gravitation laws.
Now you start to confuse your potential subjects, are they to look at your camera, proudly leaning over your chest, or at that small device wristed to your hand ?
Cheers,
Ruben