I use a Cosina Voigtlander meter with my accessory shoe and you are correct it is minuscule in comparison to the size of the camera. By the way, I tend to bring a hand-held meter even with the VC meter, because there is nothing better the an incident reading in my book.
If I can, I'll take an incident reading even with my digital SLR, because a reflective meter is prone to be fooled by variances in luminance within the frame and different colored backgrounds.