Cathay Pacific Asia Miles - Which flight would you take?

Looking at going to HKG this weekend for 5 days. With an I class sale that CX are having from ICN, I can take a flight to either CGK, SIN or KUL for only a little more than the I class to HKG! (SIN only $100more!)

I am wondering which of these flights to take with a same day turn around. Under the rules, I can have one stopover in HKG, so I travel:

SEP12 ICN-HKG CX417 transit
SEP13 HKG to X above
SEP13 return to HKG
SEP16 HKG-ICN CX418

For comfort of a day trip, would you take CX723/4 KUL RTN (0850-1230/1750-2145), SIN CX717/6 (0900-1230/1825-2210) or CGK CX777/6 (0920-1305/1505-2050). I am wondering if this last option would be viable, due to the need to get a visa on arrival with an Australian passport.

Also, can I check-in on departure at HKG for the return same day flight?

Thanks for your help.

I'd take whichever flight had long haul business class, rather than regional.

Regional business class on CX is not so nice that I'd want to spend a whole day flying and in airports just for 3xxx or 4xxx miles.

From the assigned planes, I think that would be SIN then. Seems like the best option probably- and the longest on the ground, and the easiest to head into town and do something for a few hours.

Ended up booking to SIN, using the 74A flight in both directions- only 3.5 hours in SIN though- enough to take the MRT into town for a quick bite? Or should I just head over to the QF First class lounge and wait there?