Quote: The Mamiya ZE-X was released in 1981 and had an optional left handed shutter release. Ron Herron has a picture of one in his collection. Mamiya Z-Series 35mm Cameras It's true, Mamiya offered this, but frankly:
If you are used to Pentax build quality, you won't be thrilled by the Mamyias...
I have/had a ZE-2 and ZE-4, not bad cameras, but much less rugged and solid than a ME Super or Super A!
And the left hand set should be really hard to find!!!
But the Ricoh XR-X/XR-M with K-Bayonet offers the facility to set the delay of the self-timer to 0 seconds and the self timer start button is pressed with the left forefinger. Setting to 0 means, the shutter fires immidiately.
Another possibility might be the Pentax Flash Grip for the AF 400 T plus a cable release...