Once you've cut past the flower it's done but since you're only looking for the tropical look the mother corm of the "dead" plant will still supply any pups left behind. If you do happen to cut beneath an emerging flower just chop it to the base and grow out the biggest pup which will grow all that much more vigorously from the added nutrient supply from a larger corm. Sometimes you can give an educated guess by the age of the plant and the tapering of the p-stem if there is a chance of a bud being present but not always. Everyone in a cold climate should be familiar with this thread , it's a gem.
Time to put the bananas to sleep for the Winter