Outnabout, no problem. Until recently, HF had been my primary intelligent human contact for about ten years.
romeocharlie, domestic HF, callsign "Flightwatch", don't have selcal. At least they didn't up until last year when I ended my ongoing relationship with them. International HF, callsign "Brisbane International" do have it. So it depends on who you are actually talking to. We would try and use Brisbane when we could even if strictly in Flightwatch airspace so that we could have a selcal watch. Check the enroute charts, selcal is noted below the frequencies for the stations that have it.