Hi Pascal,
I also have my reservations with 'real wooden decks' on model ships. As I'm primarily a plastic model builder, I have spent some time in trying to find some ways of simulating a wooden deck on a plastic model. To me the trick is largely a base colour (Humbrol), and when thoroughly dry an applied wash of artist's oil paint, in my case Talens' Van Dyck very dark brown. The colour does more justice than black.
The base colour leaves room for variation, between wood sorts and degrees of weathering. I did a sample of several Humbrol colours, each with the dark brown 'caulking' applied. See below:
For your intention of the decks of 'Hydrograaf' my choice would be Humbrol 196, this really is light grey, but with the brown wash this gets just the slightly beige teint you're looking for. If you look for a little more colour (like in the last close-up), then H121 or H103 would be my next choice.
As you see, I even experimented with no base colour at all, and I have even used this to good effect on some WW1 German cruisers.
I hope these suggestions are of some value to you.
"I've heard there's a wicked war a-blazing, and the taste of war I know so very well
Even now I see the foreign flag a-raising, their guns on fire as we sail into hell"
Roger Whittaker +9/13/2023