Those are some nice looking buds you got there. The only time I worry about a late flower Hermie is when I'm doing a continuous grow then if they pollinate a flower that's real early you get all kinds of seeds and you're in trouble. But, if you did leave the one to try and see if you might just get a very few seeds out of a couple buds that's usually the way it works late and flower.
And they will be Autoflower seeds just like the original. If it's one that doesn't need to go that far and then hey you have you have a great plant to grow out over and over.
That makes we wish I had so much more room like your self to do more experiments, I'm loving the idea of having a go at my own seeds...I'm already seeding the idea to the misses we need to move...I want a bigger tent.