Singing Cowboy - How did he do it?

Hi everyone!

I have a slight problem. Back in the Overheard thread, Cosmo said that he built a singing cowboy using a combination of the Mysterious Stranger gunslinger archetype and the Arcane Duelist bard archetype.

Now, I know that trying to do anything Cosmo approves of is dangerous to both my mental and physical well-being, but the concept is just that little bit too hilarious and awesome to pass-up. The problem is that since I typically do not multi-class, I have no idea what balance to strike between the two classes, or at what point I should even start taking the second class.

So, Advice board goers, advise me!
Except for advice saying that I should not do this since it was Cosmo's idea. It's advice I am going to ignore, so don't waste your time.

I could see it being just a 1-level dip in Gunslinger (Mysterious Stranger) for a gun, focused aim and charisma-based grit.

Gunslinger levels are not necessary for firearm use. DEX-to-damage is what, 9 damage at the end of the game? More levels in Bard gives you more Bardic Performance (+5 damage) and more Arcane Strike power (+5 damage), so you barely even need that.

However, I would advise you to take the Juggler archetype, as it allows you to effectively TWF with pistols by throwing one up in the air and reloading the other, and then shooting and vice versa.

So with Juggler, as a Human:

S8 D16+2 C14 I8 W14 CH15

1. Military Tradition (pistol proficiency, something else proficiency), Rapid Reload

3. Gunsmithing

5. Amateur Gunslinger (Quick Clear)

7. Point-Blank Shot

9. Precise Shot

11. Deadly Aim

The sensible exit points for Mysterious Stranger are Level 1, Level 9, and Level 11.

Level 1 gets you: A Gun, Gunsmithing as a free feat (this saves you so much money on ammo), a grit pool and a handful of useful deeds.
Level 9 gets you a bunch of stuff but mostly: Gun Training 1 (Normal Gunslingers get this at level 5, which is the sensible point at which to leave the class, but Strangers put it off.)
Level 11 gets you Signature Deed (presumably for Focused Aim).

But probably Mysterious Strange 1/Bard 19 is the best build.

I saw someone in PFS do this with Spellscar Drifter Cavalier and Animal Speaker Bard (to help him communicate with his horse.)

I'd done some private work on a "singing cowboy" Gunslinger Archetype....