ios – Can you unlink devices from identity?


I got the new iPhone 14 Pro and was wondering if I can unlink my old iPhone from my identity, while still keeping iCloud activated on the device.

For example, a contact tried to send me some photos via AirDrop, but selecting my Contact picture wouldn’t work, instead they had to choose the device separately.
Another example would be my alarm clock. Each day, the alarm goes off on both phones, so I need to turn the old one off each evening.
Also, can I safely delete it from my device list in “Find my”?

I would like to keep iCloud active on the old phone if possible, as I use it as a backup device, so connectivity with my Cloud service is much appreciated.

Does anyone of you know how I can achieve this? Or is the only option to turn off iCloud?

Many thanks