Yes they requested the same from me too in the EU. For ticket proof you can try ownardticket (dot) com
For proof of accomodation I asked my friend who lives in Thailand with his GF to give me a letter of accomodation showing my details, and mention I can stay at their home as free of charge and mention their address and his Gf’s Thai ID.
It was accepted.
Many people just book a cancellable roon on Booking or on Airbnb.