Hi Wcing,
It is true that they said that Singapore Scholars are not allowed to participate in SEP freely. However, if one really wants to join these overseas stuff, they either need to go through a tedious process of contacting the Ministry of Foreign Affairs (which my friends went through hell), or just simply don't tell anyone (which I think is a bad idea).
But for whatever reason, if you really got this scholarship, ACCEPT IT! This is probably the best one you can ever get, better than ASEAN actually.
