Yah sorry about this "donation" (yes these are used, since we dont produce these anymore for a long time)....I don't know what India is thinking doing this. We should give our brother Myanmar something lot newer and better....or not give at all imo.
I have feeling its for display purpose and maybe cockpit training/familiarisation officially...and maybe few other reasons unofficially.
I think keep as Air Force, since that way yes its main purpose will be naval interdiction....but can use multirole scenario as they arise as well.
Myanmar maybe over time will get potent land to sea cruise missile platform (with C4I networking with Myanmar navy), and then JF-17 can easily transition into more traditional AF role.