I've been wondering if we could narrow it down as to who this makeshift hearse could be for. Looking on the CWGC casualty database for known burials in the Happy Valley area of Hong Kong it draws up the following Commonwealth casualties who died in 1945/46:
https://www.cwgc.org/find-war-dead/casualty/2815624/sher-muhammad,-/
https://www.cwgc.org/find-war-dead/casualty/2815585/weill,-leon/
https://www.cwgc.org/find-war-dead/casualty/2815586/desai,-/
https://www.cwgc.org/find-war-dead/casualty/75196091/husain-ishaq,-/
https://www.cwgc.org/find-war-dead/casualty/2815645/mcdonough,-albert-edward/
One of the above is a member of the Royal Indian Air Force, could it be him?
I could of course be just clutching at straws and the casualty could have been buried elsewhere in Hong Kong.