I've looked for mechanics to assist with solo role playing without dice and other material objects. It seems a little weird at first, but once you start using Diedream, it is easy to remember. This fit the bill. Though there ends up being a lot of math. Simple math. Still if you aren't good at doing it in your head, you're tired, or lacking mental energy, it can slow the flow of play.
Overall though, I've found Diedream to be a helpful inspiration for solo my gaming. Thank you for sharing it.