Lol, the bifocals thing. That'd clinch it for me!
More seriously, I also have a "camper top"
helm enclosure, and I wouldn't want to risk any
electronics to head-banging coming to or fro. I can't visualize your setup, but for me, it's a hard "no".
One more consideration. I've had a couple of situations on
charter boats where the brightness of the
helm display seriously impacted my night vision. I was able to put my hand or a chart over the bright MFD, but with an overhead one that'd be more problematic.
Just my opinion.