Just go for Rebug and you don't have to worry about any of this. Just install Rebug 4.41.2 from XMB by following the guide below (with or without a spoofer):
1- Install Rebug 4.41.2 from XMB:
Download Rebug 4.41.2, verify the md5 hash, rename the PUP to PS3UPDAT.PUP, put it on your FAT32 formatted flash drive in PS3\UPDATE, go to System Update and Update via Storage Media. Make sure there's NO original game disk in the drive and that you DON'T Update via Internet or else you would risk installing OFW higher than 3.55!
2- Enable QA:
Install Rebug Toolbox from Package Manager, launch it under Games, go to Utilities and enable QA. This is to ensure easier and safer downgrading.
Make sure you install the latest version of multiMAN (4.40.00) once on Rebug 4.41.2 to make sure it's compatible with 4.41 CFW.
It is perfectly safe, but if you follow my guide above, you don't have to enable it while on kmeaw, you can enable it after you install Rebug 4.41.2.