Many of the local cultivars are diploid but with tiny specks for seeds. The wild bananas have thin pseudostems and small fruit (pictured in my avatar). The fruit has edible flesh but a lot of seeds around 5mm in diameter which makes eating it difficult, kind of like pomegranate. I will try to grow some wild and domesticated varieties near each other to see if they will cross-pollinate. May take a while.
Someone is grafting bananas to try and hybridise them but i doubt it will work: