Alright, so the main 3 things you would need is:
1.Bannanas
2.a blender
3.an enema bag (make sure its strong)
you can already see where this is going but for some reason no one is doing this. if you blend down the bannanas as much as you can to leave no bits in it, use a very little amount of milk just to lighten it up and then use the enema bag to get it up you, but it might struggle because its not as liquid as water, thats why the bag needs to be strong and seal able.
if you squeeze it to get it through the tube and into you after a while you should get to the point where all of it is there, or youll get to the point where everything you squizze in you just starts leaking out of you.
But just a warning if you over do it and use too much it will just overflow your diaper on both ends without stopping.