How hard did you look? You can type "MP3 Player" into an Amazon search box (and I'm sure Aliexpress and other competitors) and find many devices that are exactly what you say you want.
So i may install "Rockbox" again (yes - that was an upgrade), on an Kinese express-device? But, but, but...that may sound offending -sry, just for a moment i thought, "you were missing the topic completly" so... my 2 cents OT....
Platforms, globally synchronized making the Uniform, and bland?
"A Timex ad went viral this year: 'Know the time without seeing you have 1249 unanswered emails.'"
An Opinon-Refusal-Portal; the 'Wise people Of Gotham"-Citizen-Advice-Agency, the 120%-Normality, the Blue-Milk-Canal-Logic (Kishon)
I like watches cos, there once was a time, machines got that big and heavy, that wind-like waterpowered-energy couldn't make them start, nor keep them go, and therefore a 'need' of steam-engines...
"Cos nostalgia revealed a massive, underserved Service-economy-demand."
