So..beating hans falcon, without having hand falcon

Throw up the tanks and hope to survive to your ultimate! Lol, but seriously, if you’re going against falcon I would strongly recommend against the “kill it first with fast attacks” mindset, because falcon will wipe out any squishies if it survives. I run HT, Falcon and XB under thrawn (sub optimal, I know, but my rebels are weak sauce), and if my opponent has 2x attackers with HT, all I have to do is use both Han and XB’s AOE and they will kill both the attackers even with HT taunting. Then when Phantom reinforces and hits HT with her special it will OHKO HT if the Falcon assists.
Your best bet is probably to just use geos, reinforce cassian and mass firepower in the falcon once its defenses are down.
TLDR: too many attackers will make you a huge target on defense.