Very interesting to read. I must admit I will never be a fan of the super thick and heavy leathers so I might be biased but I don't think either buttons or zippers work that well on them (At least not the monster zippers which I dislike very much).
It might not be your size but someone might love this Aero:
https://www.ebay.com/itm/Aero-Highw...365166?hash=item4b3d7108ae:g:3ugAAOSwhQtapFqT
It might not be your size but someone might love this Aero:
or those unfamiliar with the Highwayman, it runs large and has a boxy fit, good for layering. This one fits like a roomy 40 (I have an Aero cafe racer in 40 that provides a perfect fitted fit for me) or a 42. The only reason I’m considering selling this is that it is a little shorter than I’d prefer.
Measurements are below. Remember that the shearling lining adds bulk, so the shoulder and chest measurements in particular may seem a little exaggerated.
-Pit to pit: 24.5 inches
-Shoulder seam to shoulder seam: 20 inches
-Shoulder seam to sleeve: 27 inches
-Base of collar to hem in back: 25.5 inches
https://www.ebay.com/itm/Aero-Highw...365166?hash=item4b3d7108ae:g:3ugAAOSwhQtapFqT