Obtaining Czech citizenship isn't easy (speaking from experience here). You need to reside in the country for a certain period time (five years me thinks) and pass language test (and you don't learn Czech in a year - again, speaking from experience). Although there are legal exceptions to this requirement, they aren't easy to get. I doubt that being a lower-tier dance team (no offence) helps tbh.
Thank you. Yes, Mansour & Ceska are just fighting to qualify for the top 24 so I'd imagine a special exception would not be that likely.
I also imagine Australia's competitive junior pair isn't likely to have citizenship either (correct?), but the points they earn could make a big difference for the team qualifying. The other two Australian pairs on the SB list are ranked #74 & #75 out of 75 pairs teams on the SB list. (But at least they are on the list, which the third Japanese pair is not).