there are many threads on this
and many options
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I like the Optech USA system
https://optechusa.com/
because it attaches to the upper camera attachment point, not the tripod attachment point
even though I had one fail because I didn't check it properly as this thread explains:
I have another boo boo, WARNING and seeking help - Page 5 - PentaxForums.com
I also have devised a back up system using a Joby Hand grip and ultra plate
https://joby.com/camera-straps/ultrafit-hand-strap-with-ultraplate
where the metal attachment point of the camera is attached to the metal D ring of the Joby system which Is then attached to the main shoulder strap
I use that set up with my K 3 and K 3 II with lenses ranging from my SMC Pentax-DA 40mm F2.8 XS to my HD Pentax-D FA 150-450mm F4.5-5.6 ED DC AW with the HD Pentax-DA 1.4x AW AF Rear Converter attached as well as my HD Pentax-D FA* 70-200mm F2.8 ED DC AW