I say let the CECA in, masuk GQF for 3 weeks no questions asked. The CECA can foot the bill and place a bond of SGD$100K each.
If PCR test positive, they can use our medical facilities and they foot all medical bills without any subsidies, once treated they can be released into public- and the bond will not be returned. Else if PCR test negative, they may do what they want to do in Singapore and the bond is returned.
win-win for all!
Altogether now!!! HUAT AH!!!