Opps, I forgot about the SIN - BKK connections to the Indian subcontinent on CX. Sorry.

If the CX lounges are of importance to you, there's only one way to accomplish that, you'll need to fly a OW airline. Look at it this way, you're in HKG you want to experience the CX lounges, which you can only do in HKG. You can always fly the A380 on other routes in the future.

I completely understand your dilema, I too am a OW Sapphire member, lounge access is nice and I often find it hard to justify flying an airline where I can't earn OW points and requalify for elite status.