Today I connected a Deutsch plug to the EXT5/25A cable end. Much easier, because longer end, it took me less than one hour , plus one hour for “finishing the fixing”.
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The strain on the brake fluid sensor cables was, in my opinion quite OK (strain not visible on the picture).
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But I was somewhat less happy of the wires of this connector rubbing on the black wire bundle. In the “very long run”, the insulation of the (mainly lower white) wire could become damaged.
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Concerning the Deutsch plugs, I don't know yet what I will use them for, But at least if If I have some problem at night "under the hood" I can connect a LED lamp to it (I have 3 ready: two stronger ones and a smaller toy), unless I have a dead battery of course.