I think about better example for you to follow would be how “a napron” turned into “an apron.”
However, I’m not a fan of “noone” as it doesn’t look like it would be pronounced as “no one.” It could perhaps be “no-one” or “noöne”, but they seem off as well. And very few people use umlauts in English to signify that the two consecutive vowels are separate sounds (The New Yorker is the only publicaton that I know about that does this, but I’m not sure if they stopped).
I think about better example for you to follow would be how “a napron” turned into “an apron.”
However, I’m not a fan of “noone” as it doesn’t look like it would be pronounced as “no one.” It could perhaps be “no-one” or “noöne”, but they seem off as well. And very few people use umlauts in English to signify that the two consecutive vowels are separate sounds (The New Yorker is the only publicaton that I know about that does this, but I’m not sure if they stopped).