Looking at your first picture there, the line that feels safe to me from the house is about 5-10 yards left of the second fairway bunker. If I aimed it there, I wouldn't hit the house (99% of the time anyway). I think what you need to do is encourage people to aim it over there. Couple of thoughts on how you could do that. I'd make the waste area more punishing. Right now, if you hit it in there it sounds like you're better off than in the fairway bunkers. Why not put more scrubby type plants in the waste area so that if you are in there, you have a high risk of having no shot. Then I'd take out the two bunkers on the right and put them on the left past the waste area. That would leave you with a hole where the braver you are the better your second shot is but if you're brave and you miss, you're in the waste area or the fairway bunker, not the house. If you open it up to the right you can hit a safer shot over there and take your trouble on the approach shot.
The other thought I had was to change the angle of the green, so the approach is easier from the right than the left. Sounds like that's not really an option. As to the greenside bunker, from the pictures you posted, you could remove the first two thirds of the bunker and it wouldn't really change the optics of the hole that much. That should speed up play some and cut maintenance costs I would think. Leaving people with a 40 yard bunker shot all over bunker is very likely to result in more than one bunker shot and a lot of raking. 90% of the time it's going to penalise the lesser player as that first two thirds is probably not in play for the good player unless they are playing from trouble. If a good player ends up on fairway there, they still have a tough shot over the trap to a narrow green.