Tour from the Netherlands to Italy

I would like to do a tour on my road bike this summer, from Maastricht (south NL) to the north of Italy, lake Lugano specifically.
I would like to go via Grindelwald to cheer for friend who will be doing an ultra run, so this will mean a lot of climbing in Switzerland for me. The rest of the route I still have to decide on...
I don't know Luxembourg or this eastern part of France very well so tips are very much appreciated!!

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Especially the part is Switzerland is gonna be wild, not sure if there are options with less climbing...

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Wouldn’t the climbs be the cool part?

Looks amazing! Nice plans.

Very, very jealous

The climbs are the best bits. You could consider the Sustenpass instead of Grimsel+Furka, I guess it depends where you're planning overnight stops.

I guess you're right! Just looks a bit intimidating at the moment haha. Thanks for the tip I'll look into that.
I don't want to plan the stops beforehand, I want to try a different approach to previous tours and sleep in a bivy, start cycling early in the morning till late in the evening (and take naps during the day)

sleep in a bivy, start cycling early in the morning till late in the evening (and take naps during the day)

it's the best way to travel!

Looks beautiful route. My only thought would be to pack for changeable conditions to not get caught out.

Good advise, might have to get an insulated gillet or so