There is no need to remove one to keep the other. The only reason why K3II does not have flash is, that they simply reused the whole body and added horrible plastic dome at the top. That was design disaster driven ONLY BY COST SAVING MEASURES and nobody should try to explain how there is no place for GPS in camera body such huge as K7/K5/K3 line, while it can be perfectly fitted into tiny wristwatch. It easily can be placed under top LCD status display with zero impact on accuracy or usability.
K1 is 2010-2011 project, basically prototype that went to market and then was replaced by finished model called K1II.
Dan Rentea:
Considering your previous post: try to take picture of yourself in the bathroom with light switched off while having only camera body and lens. Then you'll quickly understand what is the difference between having some picture and having zero picture. Talking tales about ambient light is completely out of the scope and you missed the point obviously. And please don't try to "explain" to me how flash photography works or how to balance available light with flash. I know well what build in tiny unit is capable of and what one or more hot-shoe mounted flashes + external flashes can do.
If you work with softboxes then you can pack Cactus V6II triggers (that even enable you to use HSS) and do not bother with easily portable wireless flash commander. But the truth is, that for example AF540FGZ can reliably fire when triggered by commander IF YOU TURN THE LIGHT SENSOR TOWARDS THE CAMERA WITH COMMANDER. Logically if you just place the flash somewhere and lit its backside, it won't fire.
(+ there also is difference between slave1 and slave2, because of pre-flash intensity + duration and communication method. Long story shor: AF540FGZ switched to slave 2 with sensor facing camera can be fired outside at 15 meters by build-in pop up flash easily with no need of any other dedicated equipment)
Not to mention that for softboxes and serous shooting it is not usual to use hot-shoe flashes placed in softbox. Dedicated units with build-in radio and external power source are being used. But that is completely different story that has nothing to do with portable wireless solution that Pentax offered for ages and that was killed in K3II+K1 just to save some miserable $5 on unit production cost.
Last body was KP and it has its flash back. Reduced in power and size, but back. And I hope that some photographer returned to drive the design center instead of being ruled by accountants.