Couldn't agree more about the LEGALITY of using other charts -once approved by ones regularity Authorities(the home nation in a wet lease issue)...Pilots talk and 'learn'about a better way-Co's look into it,for acceptance.(Jepp's versus the 'Nordic charts??)..And as you say all the different types of 'one'aircraft(A320),all are trying for the last kilo uplift...
cheers
"but your Honour, it looked good to me"