Thanks.
I will not be driving / take my car across, so in Cambodia we depend on Public Transport / Taxi, and thought that going via CC to PP is easy and does only take a couple of hours. But not 8

Getting to BKK and back is no problem. Will take the late afternoon flight from Satuek and have a flight early morning to PP. Can stay the night at my SIL.
On the way back from PP, take a morning flight to BKK, and take the +/- 14:00 flight back to Satuek.
Edit: It's also a 1.5hour drive for me to get to CC, so it would be a 10 hour+ trip (no idea what state the roads are in in Cambodia)