Linked to this question:What are all sources of extra uses of bardic music?
I am working on a Character Optimization exercise, in trying to maximize the potential of a Bard 5/Barbarian 5 start, I have elected to use the rest the levels to advance bard due to the spellcasting and other benefits inherent in a magic class.
However, that leaves me the unfortunate challenge of maximizing the impact of those 5 levels of barbarian. Mostly, I think the most helpful feature for the build which is similar to a raging Warrior Skald, is the actual rage feature.
I want the character to be able to rage as many times per day as possible. I am aware of the feat Extra Rage and the options listed in this answer: How can a barbarian rage more often without taking levels or feats?
Are there any other options rather than these , within official products, including dual progression bard/barbarian classes?