Has anyone attempted to run Mutant: Year Zero as a classless system i.e. no roles? If so, how did you do it and what were the results?

I've been looking into this but wondered if anyone has attempted this in the past.

The first idea I've had is simply to allow anyone to take any class skills, but I am worried that some builds might be overpowered. Likewise the players could select one 'key' skill to raise to 5.

The second is to strip away many of the more overpowered (looking at you, shake it off) or redundant skills (i.e. Find the Path could be managed by roleplaying out encounters and managing scout checks, Make a Deal could be handled through roleplaying and Manipulate). Other skills like Jury-Rig could become a standard skill.

I know gibbons aren't mentioned in GLA but they count as apes, so I'm making one.