Pluto Trigger has a feature claiming to "Enable your camera to record video without a 30 minute limit. The video recording will be restarted when the 30 minute limit is reached." I have not tested this with my K-50 but it is a possible solution. May be a short break where is restarts the timer but as mentioned above, editing in post could splice around a short gap.
One other suggestion - use a separate mic and audio recorder like the Zoom series. I use the camera built-in audio, which is okay but not great, as a reference track to sync the replacement audio from my Zoom/shotgun mic combo. Since the Zoom will record as long as battery and memory last, you will have "clean" audio and can do the video magic at any needed splices.
Pluto Trigger - A versatile smart camera remote
Other features of the Pluto Trigger show great promise and seem to work well with my camera. If I test the video recording limit issue, I will update. Good luck and good video!