The reason of the what you call 'mismatch' of parts is because of that the previous onwer was only 20 or so year old back than. He had the money for the frame and some mediocre parts, but than he ran out of it. He gradually fased all the mediocre parts out with parts he got donated from his uncle. His uncle had more funds and liked to buy the latest every year or every couple of years. It explains why the parts do not show so much wear. It is the reason why the slightly earlier 'mismatch' of parts is on there.
Personally I would pretty much leave it like it like that. I would do some fine tuning here and there. I would replace the QRs with nice Campag examples and the hoods need proper replacements too.
The Zieleman panto'ed stem was sort of home-anodized by the boy. It is not so proper job. I would de-anodize it and give it a good polishing. I would fill the panto'ing with red enamel.
I would preserve the red cables. I would source the same Pelten tape. Mario 'De Fietsenmaker' has it.
I think that is about it. Personally I liked the overall visual appeal a lot. It is easier to hurt it, than to improve it.
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