My view, is that a SELCAL check (like many other checks) gives absolutely no assurance it will work any time in future. With HF there are a myriad of reasons why a test at (say) 60W will not guarantee success at 40W - weather, HF conditions, sunspots, direction of flight etc etc. No question we must monitor the appropriate freqs but we should do what is done downunder and omit specific SELCAL checks. You could possibly make a case for one, but doing two or three per crossing is nonsense.