Autoreframe downsizing clip to 607 x 1080

ok I've seen that this is an issue that is unresoved - but HOW DO I DO THE WORKAROUND? 

It's completely stupid in 2024 that you change a 4k clip to 9:16 and there is no option to automatically convert it to 1080 x 1920. 

I need to send a 1080 x 1920 clip over to a client yesterday. How do i do it? 

Please help! 

I need a step by step guide