Re-enable startup chime on new Mac I want to hack my iMac's firmware - or maybe that's a stupid idea, but I got to the conclusion that that would be my only option. And please note that my knowledge of coding is at the level of writing applescripts and Filemaker solutions for my own use so I am way out of my league here. But here's the thing:

I replaced my 2013 imac with a 2019 version and it has no startup chime. Why it was removed, and why it was not made an option, is one of those inane Apple mysteries. Clearly, a lot of people are lamenting this change. 

After researching the issue, I learned that the startup chime is embedded in the firmware. Thence came the idea. 

So the question to those in the know: Would there be a way to put back the startup chime into my shiny new machine?

Thanks, and I'm sorry if it is the wrong forum, or if the question is unacceptable for using the word "hacking". I am NOT trying to achieve anything nefarious, just a solution for my own use. 

PS: I have been aware of the nonworking command line solution, I read it in this very website, I thought it was clear that I was looking for a DIFFERENT solution, involving the firmware, with some creative thinking.  This clearly can be done, Apple could do it if they wanted to, I'm sure some enterprising hacker could do it as well. I'll keep looking.
It's not possible.
From OSXDaily Where’s the Startup Boot Sound on New iMac &amp; MacBook Pro?

One theory promoted online and originating from some web forums was
that you could re-enable the Mac startup chime sound effect by turning
to the command line. The claim was that by launching Terminal app and
entering the following command syntax:
sudo nvram BootAudio=%01

And another variation which you see online are the two:
Disable the startup chime:
sudo nvram BootAudio=%00

Enable the startup chime:
sudo nvram BootAudio=%0

Supposedly, after executing that properly, the startup chime would be
enabled on the Mac again.
But it turns out that nobody bothered to actually test this out,
because it does not work.