GX1/GF2 optical viewfinder

Does anyone know of an optical viewfinder that would fit the GF2 or GX1 using the panasonic 14mm lens? I've been pondering a GF2/GX1 as a dedicated video camera alongside my Canon 40D for stills, and have been wanting a small package with big video punch, and seeing as the GF2 and Gx1 both have the video firmware going for them, they seemed to be the best option.

I'd be going with the 14mm f2.5 Panasonic lens, as it's quite small/light and is wide and fast enough for indoor and general use, no need for a zoom for video (too shakey for my liking!).

Would there be a 28mm optical viewfinder that I could use for this, and if I was to get a 28mm optical viewfinder, would it work as expected? I've never used a hotshoe optical viewfinder before and I'm unsure on if this will work.

Thankyou.