That they have a working dishwasher is the reason AFAIK for not doing the bikini deal. It's only then that the dishwasher breaks for the bikini deal to possibly be back on. If like me you play the boarding school route, the dishwasher continues working fine.
My point here though, is that at no point can you see a dishwasher. It's not in the original asset (which I have), and it would be tricky to modify the asset in order to put one in.
Would be far easier to do what it appears L&P did with the Robinson's kitchen and just use a different one. To my knowledge no-one except L&P has a floor plan for the ground floor.