Excellent point!
A good example of this is Babel, a JavaScript compiler whose main goal is tranforming modern JavaScript code into JavaScript code that older environments (browsers/Node.js) are able to run. In the very beginning, Babel focused on outputting human-readable code, but several users noticed that it was not following the specification strictly. Nowadays, Babel abides by the specification as close as possible, but the code it outputs is nearly unintelligible!
I believe we don’t need to build a new system, there are some existing ones that should do the job. For example, you can open a GitHub repository dedicated to this code translation service. The repository does not have to contain any code, just a README file explaining what the repository is for. Then, people can use the issues tracker to post code translation requests and fund these requests through Bountysource, for example.