Depends on how the developer is locking the content. If all of the builds are the same, then technically yes you could alter the game files to unlock it. But if the tiered builds are actually different builds, then no, impossible. Not my area of expertise anyway, not sure it's even possible with CE.
The values for skills weren't easy to find. CE will not scan for the decimal places at first, you must reduce your scan until the decimal place you're looking for is shown. Scan, train, repeat. I was able to set my endurance and strength to 100, and locked the fatness at 0. Trying ticking the box for Rounded (default), that's what I was using.