I'll answer as best I can, although I don't have these specific gloves and I don't ride motorcycles.
However, I am familiar with a few of the Hestra models. Typically Hestra gloves have great dexterity, provided you buy the correct size. Considering skiers also reach, although not usually 70mph, but higher speeds and winds wouldn't be a concern. Also considering there is a Gore Windstopper membrane it's safe to say you're covered there.
Overall, I'd say it would be a useful application of the glove. The only thing I'd give a little extra thought to is the temperature. It's going to be a warm glove and 35 degrees really isn't that cold. Maybe 35 deg, + 70mph changes that though.
I'm a big fan of Hestra gloves for warmth and comfort.