Change can sometimes be risky. But fear of change, just because it is unknown and different, is just plain stupid.
"The usage of the metric system varies around the world. According to the US Central Intelligence Agency's Factbook (2007), the International System of Units has been adopted as the official system of weights and measures by all nations in the world except for Myanmar (Burma), Liberia and the United States, while the NIST has identified the United States as the only industrialised country where the metric system is not the predominant system of units. However, reports published since 2007 hold this is no longer true of Myanmar or Liberia. An Agence France-Presse report from 2010 stated that Sierra Leone had passed a law to replace the imperial system with the metric system thereby aligning its system of measurement with that used by its Mano River Union (MRU) neighbours Guinea and Liberia.[Note 6] Reports from Myanmar suggest that the country is also planning to adopt the metric system"
The way to push the agenda for right-side driving (left-side steering wheel) would be help migrate a few key countries, thereby making left-side driving significantly more expensive. Which countries would these be?
While Japan produces a lot of cars, its citizen own few.
India, with 70 million vehicles, would be a meaningful target, as part of a larger infrastructure investment. It could lead to neighboring countries to adopt the trend.
South-African countries should also be targeted as part of an infrastructure investment.
Has been done successfully before:
"There are lessons from this, half a century on. One concerns revealed preferences, or how well people can imagine something routine becoming different. Swedes hugely opposed the idea of new driving habits, yet promptly accepted the changed reality with a shrug. A second lesson: other countries coped just as pragmatically. Iceland switched to the right in 1968, followed by Ghana and Nigeria in the early 1970s. Samoa went over to the left in 2009, aligning itself with nearby Australia"
Power plugs and sockets
It would seem that a dual-standard Type A&B for the Americas, and C,E,F, for the rest of the world, would make sense
Voltage and Frequency
Dual-standard 220-240V/50Hz and 100-127V/60HZ looks like a good plan
Emergency Phone Number
Why not do it progressively; each country keeps its own, and adds 999 (a single number for fire, police, etc). After 10 years, the local one is removed...
Daylight Saving Time
Just abolish DST. This is probably one of the simplest to implement.
Move away from scripts and unto alphabet.