Hi, (disclaimer) I happen to make bezels, and have one available for the 2004 lcd.
You don't clarify what the application is. A domestic setting? or an industrial/commercial application.
The thing to consider is what level of dust/moisture is permitted, and what certification you have to provide.
However, having bezels etc "lab certified" for dust, water, humidity, chemical, explosive environments etc etc is very expensive, and prohibitive. Any hole in a certified enclosure may de-certify it.
There are IP rated buttons that may be useful and are relatively cheap. However, ingress protection around any display hole is likely to be a problem.
For a project where I didn't want any external buttons (a NIXI clock), I used a cheap 1527 RF remote control (4 channels). You might be able to use that to replace the functions of the buttons. Then if you mount the LCD behind a clear cover of a certified enclosure you might be in business - by not cutting any holes in the enclosure.
Yes, you can make (3D print etc) a bezel (or you can check our what I offer on my site), but again level of ingress is a key consideration.
Ultimately this all comes down to how "certified" this has to be.
Disclaimer: I happen to make bezels, but they are not "certified". I think it's unlikely you will find an industrial bezel within a reasonable budget.
I hope the remote control idea is worth looking at.