About the only way I know how to do what you want, for the time being, is to create a "Favorites" trip to include all your custom stops (with full addresses). Doesn't matter that you'll never travel this trip, but you will have all your Stops that you can copy the details for over to your active trip when you need them. A lot fewer keystrokes that way. You just have to copy and then paste the details from one trip to the other. Or, maybe simpler, keep all your Favorites data in a Word or Excel file for even quicker transferring.
Mike and Cindy
2016 Tiffin Allegro Open Road 34PA
2018 Chevy Malibu