How proprietary are Sony's remote controls when controlling ES preamps?

I only want to control the Volume Up / Volume Down button via a thin/sleek Sony via a remote control on a TA-E80ES preamp.

Are Sony preamps strictly "married" with their designated proprietary remote controls?
Or, could various other types of remote controlls also work with premps such as the TA-E80ES?

Sony designated RM-S808 as the official remote control for the TA-E80ES.

But I wonder if a much cheaper (and more readily available and more sleeker and more ergonomical) remote such as the RM-S33 or RM-S6 could send the same Volume Up / Down signals to the Sony TA-E80ES? Thanks!
 
Realizing I may have asked a difficult specific question, I set on a quest and found this handy little pgorammable remote!
Apparently this high quality programmable remote can learn, remember and reproduce, the infrared codes given out by the original remote!

https://www.amazon.nl/dp/B0014F2CJC?psc=1&ref=ppx_yo2ov_dt_b_product_details
I assume any programmable remote could do the same!? This one worked like a charm!

71CLVEwvk3L._AC_SL1500_[1].jpg