For the EFI booting problem the solution was really simple, to the point that I found it on my own.
As soon as I reinstall Haiku on a Macbook I will make a video on how to work around the problem.
Am I right bwfm is not there yet?
Yes, it isn’t very high on my priority list at the moment, and at this point probably won’t be until after beta5.
No rush. In any case, I’d like to dump the NVRAM config of my BCM43602 before we start experimenting with the OpenBSD driver and firmware. And to do that I’d need to install Linux and passthrough the PCI device to a QEMU with macOS. I have a feeling that beta5 release will happen sooner than I’m done with all the things on my side 
One question though, when you add the bwfm driver to the codebase would it be possible to use/backport it to the beta5 release? I think more people could benefit from it if it’s not a “nigthly-only thing”.