Salaam Sidi,
I doubt very seriously that you will find these poems online. You must find the book Diwaween as Sita which is a collection of poems by Shaykh Ibrahim Niasse. Reading these poems you really see his closeness and love for the Beloved Prophet.
And it is reported that Shaykh Ibrahim said:
Whoever has this collection of poems in his house, The Prophet will never leave that house.
All the poems you speak of are in that book Sidi.
I recommend if you have contacts in Senegal, Mauritania, Nigeria, or anyone living in the areas that the People are finished in the love of Shaykh Ibrahim you will find it.
Salaam
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"your fuqara are my fuqara, your disciples are my disciples, your companions are my companions" Saying of Prophet Muhammad to Shaykh Ahmad Tijani