After paying reddit user u/dahmze1 to make me a model of the inner bezel, I tried to print it. Sadly it didn't fit at all, so I've started modeling it from scratch again.
Lucky for me my modeling skills have improved significantly and with a model to start off from I had a little better success.
After tuning in my printer, I printed the first attempt. Alas, didn't fit. But it's getting close...
Clearly some tweaking is still needed.