Do you mind paying extra for sometging that just works, or dontmind having to topup mid cycle or when changing country

Ais sim2fly has esim or physical sim, has a package that covers asia+australia. Not the cheapest though (6GB 10day 399Baht or $12, 30GB 30 day with call 2490bahr) . Benefit is that they are an actual carrier, your data is routed through Thailand , and no middleman . You need a visa3Dsecure card to top up using third party website and then can redeem packages

https://www.ais.th/en/consumers/pack...oaming/sim2fly.

For context for individual country rates (~per GB per 7-30days), cheapest australia data is about $0.5-1/GB (routes through 3HK though). Malaysia and Singapore is about $1/GB (Europe or 3HK), hkg is about $1-1.5/GB, China is about $2/GB

Rare to find something that covers 60 days, it's usually 1/3/5/7/14/30 days, then 3/6/12 months. You ok to manually top up midway?

Eskimo does not cover Singapore (likely bc they are based in Singapore and dont want to go thru the SG regulations)


https://www.getnomad.app/apac-eSIM
This covers your list too and it's about $2/GB
https://esimdb.com/region/asia