Every CFW has ban risks. I believe COD: Ghosts and Advanced Warfare are insta ban games. I played online with both, using PSNPatch 4.70.07 to disable CFW, and spoof IDPS (is my buddy's PS3 that is already banned).
At the very least, my MFW can come in handy for someone downgrading on OFW 4.75. After patching NOR with any version noFSM patches, Playerkp420 4.75 can be installed. Then you can use Habib's standalone QA flag, to enable token and install whatever CFW version you like.
I have never had a problem with any of the MFW that I have shared in public. When OFW 4.70 was released, I had 4.70 CFW 2 hours later. Playing instant ban games like COD: BO2 with no anti ban eboot.
I would think a 4.75 CFW made from MFW Builder would be safer than any spoof. If your going to play online, wouldn't you want to be as close to stock as possible. So if there was a change, they don't see you still have the old version.