Hi,
Perhaps writers could adapt to the written word the method that Blue Bottle used to use on the Goon Show on British radio years ago. He used to speak to someone, and then speak his thoughts out loud by first signalling that they were thoughts by saying the word 'thinks'.
eg Yes, mine capitan, I will hide this lighted stick of dynamite in my trouser pocket. Thinks: You dirty rotten swine, you are trying to dead me!
Best wishes, Clive