So the thing with HH is that yeah, after you get all the drops down, you're left with going after the special in the kickout hole "only". It can feel a bit dull at that point, but it's matter of personal taste.
Folks have explored making the conversion to reset the drop targets in the past (if you search on rec.games.pinball there are discussions about it in years past). And it is possible to do, but is not a simple task. Then the issue is that it skews the scoring of the game, which can shift the problem to making it too easy from high scores.
HH is a decent enough title though. They made a bunch of them, and they got played to death. Finding one with good cosmetics is challenging. It's one of those games that if a nice one popped up locally and was priced nice, it's a good game to try until something more compelling came along. Or it could just grow into a keeper.