Any rollbar that is likely to be functional rather than ornamental is unlikely to fit under a fully functional Morgan roof.
Best I've seen is an oldschool 9stud where the roof bars can be bunched around the rollbar with Velcro strips.
I've not seen anything for an easy-up.
You could get something made special (which is pretty reasonable cost wise) but it will not be to safety spec's.
Techniques might be able to help as could Satefy Devices directly.