Unexpected Keyboard
https://github.com/Julow/Unexpected-Keyboard
Available on F-Droid
You can pretty much configure the whole layout. Not sure about gif support though.

Do you know the old saying:
if privacy is outlawed, only outlaws will have privacy.

Just because people might do stuff with things that isn’t intended or even illegal doesn’t mean you should be banning said things.
Otherwise we’d be in a world where we have no kitchen knives, axes, wrenches, food, money, cars, planes, ships, bikes, hands, feet - you know what I mean?