Hello and welcome. I did a quick internet search for "African continent Banana Research Stations". You can use the below links as a start. Some may offer banana plants or they can tell you where to get them. There were many more links but these seem to be a good start.
https://musanet.org/regional-networks/musafrica/
https://www.facebook.com/bananaprogram/
https://fruit35.blog/wp-content/uplo...-Banana-EN.pdf