Okay. I'm going to have to reevaluate how to pursue publishing in light of this.
My original plans for the series baking in my head was a sequence of not-obviously-related novellas and at least one large novel. Now I'm wondering to what extent serializing the novellas first would be productive.
You could start with serialising one of them and seeing how it turns out. Since you retain the rights, you could always pursue other publishing methods no matter the outcome.