How about slicing courgettes lenthways and drying them in an oven at about 100°C for 30 minutes just to remove a little water but not shrink them. Use the thin slices of courgette as a pasta replacement. You might manage to swap thin slices of a white mold goats cheese, cut whilst chilled or barely freezing, for your bechamel.
As a general rule when cooking with aubergine and courgette I regulalry dry them in theoven on a low heat before adding them late on to curries or stews it intensifies the flavour improves the texture and avoids the wateriness that can ruin them if overcooked.