This already exists. A small team of us on the MSFS forum are in the process of building an entire CJ4 cockpit with some cool features not normally seen in most community AM panels. When it's complete, we'll be submitting our instruments to be included in the AM store.
This is still very much a work in progress, but at the moment, we have a pretty complete, working cockpit with all the instruments you'd need, including the MCDU. All instruments work. There's still work to be done and features to be added, but you're free to download the files from our GitHub page.
https://github.com/Simstrumentation/Air ... tation_CJ4