We found a variation on that idea, the roller is slightly larger diameter than usual, the non-handle end has a removable plug in it.
Hold the hole upward, pour in 1.5 litres of paint, refit the plug and you are ready to go.
The paint comes out through the roller, extremely little splatter, and a lot nicer to use.
They also have a roller with a 45-degree angle to cit into the corners. again much easier.
Using acrylics, they wash out and are ready for next time the boss [She who must be obeyed] wants something painted.
Worth having a look at the local store for.