Angela,
I've got use of my right, not left, so using my little point-and-shoot digital (olympus 790SW - shock, dust, waterproof - awesome camera) is easy enough, but i want to get back to using my pentax 35mm (mine is a spotmatic, a little older, bigger, and heavier than your k1000). obviously like you said, using a non-auto-anything SLR is a two-handed job. now, i can use it on a tripod, but that really limits what you can do. i'm planning to make myself a sturdy shoulder-mount for it, kinda like something i've seen pro videographers use to help them support heavier cameras for all-day shoots. (of course, i'll look like an idiot but i got over that a long time ago. see
http://www.flickr.com/photos/55365281@N03/5704296707/ for proof.
basically the idea is that the camera would hang out more or less in shooting position all the time so you could wind film, set exposure, and rough-focus, i figure i can then manage to fine-tune framing the shot, fine-focus, and trip the shutter with one hand. in your case, i would suggest permanently attaching a short shutter release to put the shutter on the proper (left) side of the camera, or at least where you could reach it while focusing/fine tuning the composition of the shot. think that would work?
-b