Burn/ buried the carcass immediately with only the immediate family presence. Cut the crap of LKY body on display to the public for everyone to see. NO need to see a dead 90 years old carcass. This old fart has attainted 五福临门 and is 满了。
Then hold a church or ritual or remembrance is enough, go modern.
Don't get it, ask your lancheow angmoh friends, angmoh are the best.