Reverse beep disabled! (Australia/Europe)

I love the reverse beep.

Whenever I put my Prius in reverse that repeated beeping is like a chorus of angels reminding me to be careful.

Or is it a pit of demons reminding me I don't have a reverse camera on my 2013 Prius Two?

I can't remember.

 

I admit, I'm spoiled because the last two family cars we've owned had backup cameras. But I might consider installing backup/parking sensors if the price is right (2006 iTech, let the mods / upgrading commence | PriusChat)

 

Hello everyone,
I know the thread is old and I am new here
Looking at the photos taken during dashboard disassembly, I came across the idea to connect the speaker (beeper) via relaythat would be trigerred by reversing signal and when not powered (not reversing) would allow normal beeping (seatbelts, warnings etc).
The question is: is there any reversing signal cable nearby and is there enough space to do something like this?