Wifi works fine on Silverblue, but not seen by Bluefin

This seems like the same issue I was having earlier. I asked that issue to be closed but I think that was premature. At this time I can successfully manually load the kernel module after boot, but Aurora will never automaticaly load it. The only thing I can do is

sudo /usr/sbin/modprobe brcmfmac

Try that and see if it works. Like you, ujust configure-broadcom-wl does nothing.