All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.
If you abide by the conditions mentioned in the fatwa that you referred to in the question, then there is nothing wrong with writing such a poem. For more benefit on these conditions, please refer to fatwa 86913.
If Allaah instills the love of a girl in a person’s heart, then he should fear Allaah and be patient and avoid any act or statement with her that would cause the Wrath of Allaah and render the person sinful. Moreover, he should hasten to marry her, if possible. Ibn Abbaas narrated that the Prophet said, “The best solution for those who love each other is marriage.” [Ibn Maajah]
Allaah knows best.