They don’t need to see your return ticket. They may ask to see your ticket exiting Thailand. You can buy a boat ticket online for a boat the malaysia (I assume you are island hopping from ko lipe, Thailand to langkawi, malaysia.
🤷🏻♀️ it’s easy everywhere. You just have to give the papers they ask for. I would think Vientiane requires the same. But check their website for requirements
When I applied in Sydney (I know it’s not Perth but...) they actually WANTED to see the funds in Thai Baht. And I had to explain to them that my money was in USD and CND accounts and not in thb. They allowed it but only after a discussion. I thought it was quite strange they wanted to see it in THB for a tourist visa. But each consulate/staff might be different
I’m pretty sure You don’t need to “retire” to get the “retirement” visa. You just have to be over 50 and have the financial requirements. I think you can just get it now and not have to use the tourist visa.