Just one thing; the Pentax is a DSLR whereas the industry has moved to mirrorless for good reasons. I liked my old optical viewfinder and would still prefer it over an EVF but I would never consider switching back to a DSLR. The advantages I get from my mirrorless cameras are too valuable overall to lose.
I really benefit from live-view exposure aids. My method for setting an exposure has changed for the better using mirrorless cameras. I set a correct exposure more accurately and with confidence that's not possible using a DSLR -- mirrorless live-view highlight alerts -- I'll never go back and I'll never chimp again.
I can use all my lenses (leica, nikon, zeiss, voigtlander, fuji, rodenstock) on all my cameras interchangeably -- an advantage of mirrorless shorter flange distance. A DSLR is much more limited because the mirror's in the way.
I have better lenses because of the mirrorless shorter flange distance. My fuji 14mm wide angle has zero distortion; try and find a 14mm for that pentax with zero distortion.
There are lots of weather sealed options in mirrorless bodies (fuji and olympus come to mind).
A complete list of weather-sealed mirrorless cameras for 2019, with top weather resistant and rugged mirrorless cameras from Sony, Fujifilm and more.
www.switchbacktravel.com