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So far it is the only alternative, I approach it relatively objectively. The above statement was indeed meant as a fact. However, I still have a few inquiries with various window manufacturers pending, which I am waiting on. I like to have options.

Thank you for saying that. I specifically paid attention to it at an exhibition today and: you are absolutely right (at least with this manufacturer (KompoTherm)).

This is not manufacturer-dependent. If you really want a door like the one in the picture, there are only two possibilities: wood or not a jot cheaper than wood. I would choose wood.

or not a jot cheaper than wood

what?

The iota was the letter with the smallest character in the Latin alphabet and therefore symbolically (cf. Matthew 5:18) stands for something very, very, very small (insignificant). In other words: have a best possible imitation of a wooden door made for you and you will pay, at most, about ten units less than if you had taken wood.

The profiling suite frame - strip - outer panel - inner panel alone is very complex in this model; even the detail "muntins" in the upper panel is not trivial. You save almost nothing with alternatives there.

Your "problem" is not a slight preference for wood, or false frugality, but your uncertainty about the durability of the surface. Window makers will not help you with that (unless they have - like my suggestion Pax - all material alternatives in their program and don’t have to recommend one because they don’t sell the other themselves), but you can only clarify that with painters and varnishers.

.. Greek alphabet - not Latin.

*Smarty mode off*

.. Greek alphabet - not Latin.

correct - but the ancestor of the "i", and incidentally probably also the inspiration for the term "i-Dötzchen" commonly used today for first graders.