Xperia Z3 D6603 - How to root without unlocking bootloader please?

I want to ROOT ONLY.
Every guide I come across involves the bootloader, OR a different kernel version.
Can anyone guide me in the right direction? I just want root access. Don't want to lose keys

Xperia Z3
D6603
5.1.1
23.4.A.1.232

Thank you for any help!

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