The APG introduced the Acrobatic Performer skill feat:
ACROBATIC PERFORMER [FEAT 1]
[GENERAL] [SKILL]
Prerequisites trained in AcrobaticsYou’re an incredible acrobat, evoking wonder and enrapturing audiences with your prowess. It’s almost a performance! You can roll an Acrobatics check instead of a Performance check when using the Perform action.
At first I mistakenly thought you could make a living with this, since you can with Performance, but the Perform action is not the Earn an Income action, so you can't use Acrobatics with it. Which is a shame, if "performing" with Acrobatics is reasonable then making a living with it should be too. But the Bargain Hunter feat establishes that being able to Earn an Income with an unusual skill is worth a skill feat in its own right, so I understand why they couldn't just toss it in. So I propose a new skill feat building on it.
PROFITABLE ACROBATIC PERFORMER [FEAT 1]
[GENERAL] [SKILL]
Prerequisites Acrobatic Performer
You've done enough acrobatic performances to figure out how to make money with it. You can use Acrobatics instead of Performance to Earn an Income.
Are the thought and implementation there reasonable? If the Acrobat background is tweaked to allow the player to choose Acrobatic Performer instead of Steady Balance, a PC could make a living with it from level 2, or level 1 for a rogue.