OP,
G'Day and welcome to the forums. The K-1 is a good place to start with Pentax, a very capable and well specced camera. I use one and also have the 70-200 and can say they work very well together. I look forward to some images from you, I'm very fond of the telephoto landscape thread if this is a style of photography you do.
Originally posted by tax I am not sure, why lifting your camera just by its grip with a lens attached would produce any excessive stress on the lens mount. It it was true, then there won't be any hand straps for operating a DSLR camera by holding it just with the right hand like shown here
5 Comfortable Hand Straps for Your DSLR | Apartment Therapy Mate, I've been using a hand strap for over 5 years and whilst I walk around holding the K-1 by the handstrap when fitted with the 15-30 or some metal Zeiss lenses that aren't light, I'd not consider walking around with the Pentax 70-200 fitted whilst only holding it using the hand strap. And whilst I'm okay with occasionally using only the handstrap when holding the K-1 and 70-200 in a static situation, the potential when moving, for the mount being subject to load shock is my concern hence I prefer to avoid it.
When I have the 70-200 or the 150-450 fitted I carry the camera in my left hand by the lens tripod mount as this is less strain on the camera mount and I feel it is more secure. I also secure any sling straps to the lens mount when using these lenses too. The K-1 with these heavier lenses also results in a heavily front weighted load which is more fatiguing when only using the hand strap.
I see you have a K-1 and maybe you're okay with doing it differently but I've invested too much money to tempt fate when the lens literally has a carry handle.
Tas