Definitely go native. Sony only used to push adapted lenses back when they didn't have a full lens line-up. It wasn't really ideal but the best they could do at the time. But for AF-critical work you definitely need native lenses.
There's [ample evidence](https://www.flickr.com/photos/lescatalpas/) that it works very well for close-ups, despite not being technically a macro lens.
If you don't need a fast lens then this one is pretty versatile.
Not sure if there is a way to do it automatically but I set one of my custom buttons to Finder/Monitor Sel.
And FINDER/MONITOR is set to Monitor(Manual)
that allows me to toggle the LCD off and on by pressing that custom button.