How can I secure a round trip flight booking for my Thai visa application without risking money if the visa is denied?

Okay, I can't see this going well. The group goes out of its way to help people get the information to FOLLOW the rules and get visas. NOT to circumvent them.

You do know that you can use a bus ticket to another country to show proof of onward travel at thai consulates right?

IF you are concerned about the proof of funds, proof of onward travel, proof of a hotel booking that consulates ask for then the ONLY thai consulate in S/E Asia that will sell you a tourist visa without those things is the one in Vientiane.

Good Luck (y)

You can get a paper booking ticket, it’s a booking yet paid for just ask chics at flight counter for one.

There's one or 2 Embassys not to take for mugs and idiots with fake airline tickets.

Singapore is one of them.

Believe I shared this with you before but you can either use a service like bestonwardflights.com or use the US website of Expedia and select flights with a easy cancellation policy.

Preparation! Make sure you have all the documentation prepared, with supporting evidence, and then some. Don't leave anything to chance. Make it as hard as possible for them to have any grounds at all for refusing.