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CYOA
I did some american white oak fascia / mullion type things on my place - used osmo and followed their system to the letter - ie water resistant base coat, a coat of white exterior oil stain (for colour mainly) then two (maybe three) coats of clear exterior oil finish. They look good as new 2 yrs down the line. Quite exposed but also lots of air and light so not a direct comparison. If your client (!) wants a sharp finish then oiled timber is what you want i'd say and you'll need to re-oil on occasion. If you want a more natural weathered chic beach vibe - then a pre weathering product like SiouXX is nice to give a satin natural grey without streakiness and some protection.
Depending on where your damp / moisture comes from etc I'd tend to err more toward the side of 50mm vertical battens (in something water resistant or treated) screwed back into the wall but with sealant or edpm tape in between. Then screw your horizontal boards (again use edpm tape) to that. Accept it as a beefy trellis with some rainscreen benefits.
If you go for an actual wall cladding detail you'll need a proper head flashing detail into the wall over - to stop getting water down the back. And vent (and insect mesh) details top and bottom. And breather membrane behind the battens perhaps (not sure).