I think the entire concept of "deliberate" handball is flawed to be honest. It made sense when football was played in trousers and flat caps and the norm was for players to self-report fouls, but as soon as a neutral third party referee was created, the idea should have been scrapped at that point. We've muddled through for over a hundred years since, but it needs to be stripped back to basics now.
Someone on here mentioned the idea of "avoidable" handball being the foul, and I think that's a lot better as a starting point. Instead of looking at an incident and trying to infer intent in what was done, we look at an incident and determine what actually wasn't done.
Might still need some refinement and will definitely need the VAR to stop using slow-motion replays quite as much (as everything looks avoidable if time is slowed down enough - ref. The Matrix!), but it at least is no longer based on hoping referees suddenly develop psychic powers mid-game!