change "copy attribute" to > "copy - add attributes"

i was working with someone else on 2 aspects of a character. and when came the moment of merging everything together, that was not possible. the vertex groups could be added with no problems, so that was good. but the modifiers got completely replaced. and i didnt found any workaround.

so what copy attributes should do, instead of replacing modifiers, is add modifiers to those already there. or at least, give the choice.