I have used onward tickets many times. They are valid for 48 hours but the airline do not check as they just want to see the booking. I have used a completely fake ticket as well.
I hope you chose 'long term living expenses in Thailand' with Wise otherwise it will not show as coming from abroad. You used to be able to do a combo with funds for retirement. Some in the bank and some monthly
I'm in the same boat as you. My Thai wife decided I didn't need a motorcycle licence when I renewed my car licence. I only rent bikes when I'm on an island holiday so now I'm not fully covered 😡