I am in the same exact boat on my alt account. Minus Leia. But I think I can do it with Luke, AA, K2, Biggs, and STHan. Gear 8. I have no other rebels close. Doesn't cost anything to keep trying for a lucky rng.
Could be doable, unfortunately you don't have the extra oomph from some of the rebels you're missing (lando, wedge) or the leadership boost from them. Still feasible though, I would recommend taking in only 1 of the tanks
Use Han as lead, and everyone but Luke. AA will help clease your team from Vader and palp. It's doable with who you have, just play it smart and with good rng you will beat it
Was able to clear it using AA lead with K2S0, STH, Leia, and Biggs. Didn't use any mods and only lost STH towards the end of the fight. Luckily RNG was in my favor in avoiding stuns from Palp.
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In a pinch I can gear 9 a couple guys.
Depending if you have him unlocked in Cantina.
Remember you also have the week in which the event is happening
Yes, because he's farmable from the fleet store