Well in fact, I will not need to try with another wheel. As I was riding
home, the noise kept increasing, and at some point, my front wheel
started to slow me with a drag similar to slightly pulling on the
brakes.

That definetely comes from the front hub. When turned, the wheel slow
down to a halt in less than one second, even with the brakes wide open,
and while nothing is making any noise that would suggest a friction from
somewhere else.

I will try to service the dynamo hub, before considering buying a new
one.

Thank for all the advice!

--
Tanguy