You can order an Arabic key set from the store without ordering a keyboard and keep using the differently shaped keys on the XT keyboard. You can compare which keys are differently shaped by googling “Arabic Model M keyboard” and comparing it to your XT. The XT keys have some different shapes that I don’t have molds for.
https://www.modelfkeyboards.com/product/extra-set-of-brand-new-production-xt-quality-one-piece-keys/