welcome and good luck for woodgassing soon!
I’m from Germany, but I live in the northeastern part, unfortunately not very close to Belgium. At the moment I can’t help with practical experience, but with theoretical background knowledge. We are in comparable situations. I own also an old vehicle, in my case a Land-Rover built in 1961, which never tasted woodgas so far but i hope to change this better sooner than later. However, just started a new job, moved to another city so plans are slowed down…
Of course your Renault can be converted, just keep in mind a power loss of at least a 30%, worst 50% if just the carburetor is changed against a gasifier. There are measures to minimise this number, but you will never get full petrol power.
I like the Goelette as well, searched for some pictures. But it is a van, right? Because a gasifier should not be mounted inside a vehicle.
Have you decided to go for wood or charcoal yet?
I can strongly recommend reading through the library section, especially the two books
These are about experiences of the forties, the technical level of your Renault is close to what is described in this books.
If there are more questions on this site is for sure someone who can help.
There was the idea of organising a European woodgas meeting sometime ago. The more european members, the more likely that this could happen.