I dont know, im not the specialist in this. Dont have any reply from Greek or Roman referee.
Some sources says its greek some its roman i really dont know. i open this tread half year ago and dont have any reply that new country or issuer were made since that time.No information in newsletter Just refresh this thread as looks forgotten.
I can see now that something was made :
https://en.numista.com/catalogue/caesarea_maritima_rom_prov-1.html https://en.numista.com/catalogue/palmyrene_empire-1.html
Here you have more information https://www.forumancientcoins.com/numiswiki/documents/hamburger.pdf
http://snible.org/coins/hn/syria.html#Palmyra
Some of them are in greek some in roman and some are separate like phoenicia or judea. So its your decision where to place such coins.
https://en.wikipedia.org/wiki/Palmyrene_Empire
Former numista referee for Poland and half of african countries.
I invite you to my FB group about commemorative coins :
https://www.facebook.com/groups/1635288620035921