vw california ocean comfort mattress

[Baloni]

Upon getting our new T6 van we bought the comfort mattress which folds up nicely and is comfortable.

However we now realise that the top shelf setting can't be used whilst sleeping..... is there any way this can be overcome (without a massive expense for a new mattress)?

The options I have thought about are:

1) purchase foam to go under the two thin mattress sections that cover the back seat and effectively raise the whole bed by 2"?

2) cut thick section of foam out of comfort mattress and replace with thin section thus raising just the parcel shelf but possibly less comfortable?

The good lady and our son sleeps down stairs and she can feel a "pea"!