Yep. Just got one. Also own a firespray and hwk. Just those for my scum.

So what builds are viable enough for me to use with only these expansions?

Do tell...

Do you have a Rebel Y?

Kavil with a turret and kath scarlet is a good start.

Dual Aggressors with Auto-thrusters and HLC.

Oh you bought a Most Wanted pack, my bad.

Most of the Scum unique pilots in Most Wanted are worth using. I have only run this squad once, but I really liked it. Palob is a nightmare to fly against. And if you go after Palob first, Kath's 4 dice primary and the Y-wing's double tap will quickly do you in.

Kath Scarlet (Scum) (38)

Seismic Charges (2)

Outlaw Tech (2)

Palob Godalhi (20)

Blaster Turret (4)

Recon Specialist (3)

Moldy Crow (3)

Drea Renthal (22)

Ion Cannon Turret (5)

BTL-A4 Y-Wing (0)

Total: 99

I've had some fun flying the following:

Torkil Mux with RS, MC and BT

Boba Fett with VI, EU and K4

Binayre Pirate x2

If you have a rebel Y-Wing you can also accompany Boba with two thugs with ion turrets R4 agros and the BTL-A4 title. Those things can do a disgusting amount of damage in a joust, especially if you go straight from out of range to R2 and focus to get that action economy going in order to support the double shots.