...Thanks, Nick. That's what I thought it is. Though I liked the vowel harmony of /mühämmädü-nü r-räsûlü/...
(I think you mean /muHammadu-nu r-rasuulu/ ;)
According to Wright's Grammar, Vol. I, p. 22, /muHammadu-ni r-rasuulu/ is correct.
أقدم عالمُن ُاخرج لاستقباله = أقدم عالم اخرج لاستقباله
i.e. aqbal @aalimunu _xruj li...etc
Nothing about how to notate it, however.