If you are having issues with paginated pages appearing in SERPs that compete with your main pages, this is the approach I’d take, using script to generate that META.
Interesting idea, I personally wouldn’t. Keep in mind Webflow pagination is list-specific. You can have 20 lists on the same page, each pointing to different list-pages. The page itself doesn’t inherently have a page number.
There are situation of course where you might have only one main list, and want them to appear in SERPs. In that scenario this might be beneficial, and could also be done with script ( mod the title based on the URL querystring page ).
No, Webflow handles this correctly. As long as you have auto-generated canonicals setup, the canonical for page=1 will generate without the pagination param for that list.