I don't think anybody here has done one yet, since the Micra USED to come with the block heater standard for the first couple of
years it was on sale.
Your best bet might be to search on the Nissan Versa forums for 1.6L factory block heater installations. I did a quick search, and found some references to people installing "Canadian spec" OEM heaters.
If it's like some other OEM ones that I've seen, the heater may be a simple "cartridge" style that plugs into a cavity in the block, which makes it very easy to do.
View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...