Even if you have library support to hand hold your budget coders, even if you use a lot of them, even if you give them all the time in the world, they will produce more complicated, less coherent, less stable, buggier, and harder to modify, improve, or iterate results than better coders who understand the problem better.
That means that no matter how little you pay up front you end up paying more in the long run throwing more man hours and money at fixing the mess made. A good mess is easier to maintain and improve and costs less over time. A mediocre / bad mess takes substantial efforts to maintain and iterate on.
Its also probably a domain impossible problem to remove the ability for any coder to make bad code. If for no other reason that in any programming environment you can never stop someone from iterating by index over a binary searchable tree for a specific element in it, or you can't stop someone from turning a float into a string to truncate the decimal part to then reinterpret the result as an int. But if you don't give them the tools - the integer types, the data structures, access to the bytes in some form or another - you aren't really programming. Someone else did the programming and you are just trying to compose the result. A lot of businesses, like I said, can be sated on that, but its still not programming unless you are in a Turing complete environment, and anyone in such an environment can footgun themselves.
