Pikes. Give them pikemen too. Or halberdiers. You can also still simulate their "conservativism" by only allowing them to build musketeers from the royal barracks and nothing else. No handgunners, no arquebusiers. This way they won't get cheap and plentiful low-level gunpowder units, but the ones they do get will be very good. Make the musketeers a "royal guard" unit like those elite guard archers, something like the Greek equivalent of the janissary corps.
It's too bad you can't edit the meshes. Giving the elite guard archers muskets would make for some really cool Byzantine musketeers. All that lamellar gives them a truly unique appearance, compared to the ribbed tunics of the existing musketeers.
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