That Miracle lounge at BKK, in my opinion, at least early in the morning is just awful. I checked it out when flying AY, left promptly and headed to QR. It's great having decent one world status with BA.
Funnily enough also doing TYO early March ex PER (only for 5 days). Dumped QF rapidly despite any "enhancement" they want to offer as bottom line figure shocking. . 3.5 K business in MH and 4.2K SQ. Know who I am flying with!!
You are not alone in crediting to AY. Next year I'm also walking away from BA (really hard now in Australia anyhow) and all BA flights will also go to AY.
Indeed anything out if Doha will be expensive as a revenue. Possibly must cheaper from Europe to Doha. Also you might find simply ex Singapore, Hong Kong, Bali or Bangkok to Europe and back then revenue or points based tickets to Australia (say using VA in SQ metal) would be a much better...
Personally, without kids,...😁..I prefer the afternoon SQ departure from PER and the evening SQ departure fron SIN getting into PER for mid night. 😁. Home.by half past midnight or so and in bed after some nice food and drinkies.
When I think about it...Perth is therefore well served with Singapore flight options. X4 Singapore Airlines, X2 Scoot (I think daily), and the X1 Qantas. Not that bad with SCOOT being as cheap as. Just waiting for Jetstar to take over entirely the Qantas flight! 😜