You are right, it does sound shitty, because the promotions are based on the location instead of the language.
I doubt you would be happy if a German speaking country in which you do not live forced you to visit a physical store or a bar in the said country. It would be a promotion for German speaking players yet totally useless for you.
It's sad, but you should be happy that your promotion is at least promised. I pay the same sub like you do, yet there is almost no chance that SE would do Czech promotion so it is highly likely that I will never ever get a chance to get the items in my country while your chance will come eventually.
We understand you are pissed about it, but implying that you are more important than others is just gonna create negative feelings towards you.