Fit is more like your example with size 16 shoes for some bands, unfortunately. Examples are Milanese loops and the large sport bands. They fit, you can tighten them up, but the issue is how much overlap you get. If the magnet on the Milanese loop is up against the Watch, it doesn't look great. But with a sport or some leather bands, it's not only ugly, but uncomfortable with the massive overlap.
To circle back to your other question, at 150mm you have pretty slim wrists. That being said, I *think* you could make 42mm work. But it'll definitely be a much larger looking piece on your wrist, and you'll definitely have to overtighten straps for activity use. Link bands may be a tad awkward, but luckily there's a variety of link options out there.
It appears the link models are sold out, but there are plenty of space black options around. Here's one in 42mm refurb for $270:
https://www.amazon.com/gp/aw/d/B01M...pace+black&dpPl=1&dpID=31VYN7odt0L&ref=plSrch
Here's a retail 42mm stainless for about the same.
https://www.amazon.com/gp/aw/d/B00W...+stainless&dpPl=1&dpID=31WVzfURFuL&ref=plSrch