Another option to maybe consider is the cup and string type design, but with clear plastic cups.
Like this:
https://www.eurooptic.com/swarovski-z5-52mm-transparent-lens-cover-mpn-44102-swarovski.aspx
My S&B scope came supplied with such a design and they're pretty good. At a pinch, you can see through the cups well enough to get a shot off, espcially at close range which is usually when time is most critical, and it's the work of a moment to ping them off for a longer shot.
I've shot 1 deer through the cups which I would've missed otherwise (woodland stalk, 30 odd yds) and it means that if you have to crawl or push through thick stuff, snow, mud etc your lenses remain clear and unscratched. Best of both worlds.
I just put a zip tie round the string at the middle of the scope and let them hang freely when shooting. Can't lose them that way.
Plus, they're way more durable than flip ones. The number of pairs of butler creeks I got through on my old air rifle going after bunnies...