It may be easy to actually fly a J trip to Singapore but getting the money to do that, or justifying such use of money is not simple for most 1Ks. Of course for the business traveller based around SFO who frequents SIN that maybe an easy target to achieve, but for most 1Ks, I suspect they do not have such money - either their own or OPM - for such 'simple' requalification, otherwise they should be GS.