Back in them good ol days Android was actually multi user, like any other Unix. I had it working on some old stock Android, I recall.

I would be surprised if it still worked 😅

I see, they have been continvoucly morging the docs themselves, as per their developer docs

As I explained elsewhere there is no official app to change this setting. Users can hack their gsettings.

Support for middle-paste will slowly but surely bitrot and eventually be removed.