Nice job :-D
I thought about something similar (I mean, to reserve long stopover in HKG by phone) but my problem is lack of time before March 31st. Therefore, I think I'll choose shorter and cheaper version, which is SIN from Switzerland in Y+ for half of price of Italy to CTU in J.

Have fun in HKG!

p.s.
we're going to Tenerife too, but in July ;-)