I finally did it!
The instructions from IFixIt were clear and the process was quite easy (the newer ti iMac, the more difficult it gets… you know, Apple being Apple).
I installed Fedora Workstation 38, tweaked it, installed broadcom-wl, updated it and version-locked the kernel by editing the dnf.conf file after wi-fi was working fine.
Thank you, @glb for the tip and @sar6e for showing me it can be done without a problem.