I put the whole flower cluster through my bud grinder and then screened the results. I ground it up pretty fine, so there would not have been many bananas left intact, but they may not have been crushed as you describe.
We'll see. I had a look with my Carson 120x microscope, and there might be pollen grains in there. The sift looks like mostly plant debris to me, but there are round bits that could be pollen. Impossible to say for sure with the microscope I have.
I will apply what I have, and see if I get seeds. Right now, the mom plant has just shown sex in the last few days, so it will be a few weeks yet before I get out the brush. I am keeping the grind from the first cola as well as the sift. Presumably there is still pollen in it. I think part of the problem is that pollen is so light that getting it to separate and go through the screen is painfully slow. Too much theory and not enough solid information at this point.