OP, you may be able to get them for dessert at Jiko. They're not on the Jiko menu, but the first time we ate at Jiko I asked our server about zebra domes and where I could get them since we weren't eating at Boma. He told me that he'd get them for me.
When it was dessert time, he went over to Boma and brought me a plate of zebra domes. I think he charged me for a piece of cake or whatever Jiko had on their dessert menu that was similar.