Really, your wife could change the transfer limit in KBanks app to 500k? I have a hard time believing that because there shouldn't be any differences between a Thai and a foreigner as long as facial recognition has been registered at KBank.
You're now the second guy who says a 12 months bank statement print--out from Bangkok Banks app was accepted at CW immigration.I told that here just a couple of days ago,and they said "no way at CW", so I'm glad, you are now basically the proof it does work. I just hope those who didn't believe me reads this.
Wise would be my answer,but if you want the transfer to show up as international without a doubt,then a swift bank to bank transfer is the best choice. For future transfers, go for Wise.