Best route from Amsterdam to Mediterranean via Channels and rivers

[eiasu]

Hi everybody,
i just trasfered my boat from UK to Italy navigating via English Channel, Le Havre, Paris, Lion and finally st louis du Rhöne i entered the med.
1300km 178 locks, was quite a trip, documented with many photos
https://photos.app.goo.gl/mAvJ9uSaftHgMqHg8
And on my IG account eia.su
Yesterday a dear friend asked me to help him to transfer a motorboat Menorquin 42 FB from Amsterdam to Italy.
The boat has this specs
Lenght 13,20m
Beam
4,00m
Draft
1,10m
Fuel tank
1200L
Water tank
500L
CEE
A
WEIGHT
12T
Passengers
12
Max speed
21Kts
Engines.
2x320 hp volvo penta
Cruising speed
14-16Kts

I know all the beauty and the trouble of channels navigation but i don't know which one could be the best route.
From Amsterdam north sea until France and navigate only french channels, or via Germany bonn koblenz and joining france at Chalon-sur-Saône? Or other paths?
Which one is the fastest,easiest and more convenient?
This will happen in few months, maybe next spring.
Thanks for any advice
Eiasu