To get the firmware, you need the full installer or the RecoveryHDMeta.pkg. Don't install the new BootROM, you will loose the NVMe EFI module.Being a point-release instead of full beta, are you still able to download a full installer in order to apply the firmware? Or is it being applied by the updater now? Sorry to be dense...I'm usually on top of this, but sometimes get confused!
10.14.1DP1 is safe, if you do not upgrade the BootROM.
Edit: RecoveryHDMeta.pkg
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