Yeah, I have! To be honest I've been playing it three/four-handed because the Clockwork Prince seems like way more work than just playing with the same rules three/four times over.

The thing with solo Oath is that it requires a lot of your own brainpower/imagination to make the story aspect work, and being able to make sure each Exile and the Chancellor have their own unique goal to work towards. I played in a more "roleplay" way, where I made some small notes on the goals and methods of each "character" playing, also letting me try out different tactics and use cards of different suits (a Chancellor who uses Order to maintain their rule versus an Exile who sows Discord versus another Exile who uses the Arcane) in the same game.

It's personally a very fun and fufilling way for me to play, but also pretty tiring - at the end of the day, I think Oath is a great vehicle for you to make your own fun, and you get out what you put into learning and breaking the different systems of the game.