I believe that the EW coordinate should be before the NS coordinate. (horizontal axis before vertical axis), mainly because the projection.format of EPSG:4326 shows:
yy yy yy NS xx xx xx EW (xx.xx yy.yy)
Does it make sense ?
Sounds good to me. No objection for changing the order in the string.
Humans normally write the latitude before the longitude.
@cedricmoullet, what are your current thoughts on this?
I agree with @twpayne. It is very uncommon to write the longitude first. Also the NS/EW notation is very uncommon. Why not just use a common notation like on Wikipedia:
48°12′N 16°22′E (Vienna)
33°51′35.9″S 151°12′40″E (Sydney)
38°53′42.4″N 77°02′12.0″W (Washington D.C.)
I'm convinced by your explanations.