As the above poster stated, there's a regional here in Israel. More specifically, there's a local branch of FIRST here, FIRST Israel, and they have sustained FRC in Israel for the past 9 years with 45 or so teams each year, and FLL and Jr.FLL for almost as long with nearly 300 teams each. Since I've not been part of the early years, I started with FIRST three years ago, I can't say how it happened (I know the background story but not even a scrap of the details you'll need), but I think I know how the Israeli regional "survived" so long while other non-US\Canada haven't.
FIRST Israel was an Israeli initiative, where the government became aware of FRC and wanted to take part. For that reason, FIRST Israel has always been supported by the country. The president is a big fan of FIRST, for example. What you need to sustain the program is support from above. Not necessarily the government, a big and central university can take that part. Teams come and go, here 10 teams close every year on average. Big supporters can help spread the program, and can hold the program when there's a lack of teams.
tl;dr+extras:
- Before approaching highschools, try to get the government\a big academic center\a big company\any other body that is a significant part of local life.
- Ask about what's been done before. Talk to people who were part of FIRST in it's first couple of years or helped start it, both in US FIRST and FIRST Israel. IIRC Canada regionals only started after there were already many teams there, but checking with the original regional directors in Canada could help too.
- Check if there's FLL in the country. Many countries have FLL, and you can use the assistance of the local FLL managers to establish FRC in the country. Getting teams will be easier too, since you have hundreds (if not thousands) of students in the right age that have been through FLL and probably want more.
- If there isn't FLL in the country, try and start with that. FLL is much easier to sustain than FRC, which is why there are FLL competitions all over the world, and only 3 countries with FRC regionals.