I like the K-1 rear screen design.
I went to CP+ the year they introduce K1 in Japan, and see 2 Nikon dudes in pentax booth talk about the new Pentax rear screen design which looks over complicated and weak.it likely broke in a few month of heavy use...etc, Then the pentax guy behind counter just grabs the rear screen and shake the camera with lens attached a few second after that...
end of the story, no more speculation.¯\_(ツ)_/¯
They demonstrated it again on stage with even a larger lens. and said Pentax doesn't advice people to do this! Now it is a known fact but back then it got a lot of WOW!
On You K3 or 3II, I think you can use in combination with FluCard? I use my K3 with the card for extreme low angle, it is not the best option but it get the job done.