With the gunslinger deck just announced for June 2016, here's hoping that the July 2016 release will be the swashbuckler deck.
http://paizo.com/products/btpy9ipq?Pathfinder-Adventure-Card-Game-Class-Dec k-Gunslinger
Need to finish Base classes before (Cavalier, Summoner and maybe Magus)
Would it be possible to do a summoner class deck that contained monsters? (Something along the lines of the promo rouge eidolon from the iconic miniatures set) or would that just not work with the way OP is set up?
You wouldn't need monsters. Balazar doesn't start with any during play, hooovering them up during game play either by exchanging spells or defeating them. Other summoner character could work just as well following that model. Besides, the monsters are banished as you use them - having a summoner's deck consist of monsters at the expense of other cards would be suicidal.
I could see some coolness with the monsters themselves having specific powers when you banish them (like the Rogue Eidolon's free explore), though I agree, it'd take some restructuring of how the class deck works to make it happen/make it worth it to take them.