All? Nah.
You can approach this in multiple ways, but yeah, WT 30, lots of parry and a few ranks in durable are certainly a way.
But you can hand out just the imperial valor talent and give him a few henchmen, you can trigger fun stuff like fated duel, you can use stealth for fun stuff, just going with cortosis and some soak and some parry can do wonders as well. In general you just want to reduce the damage below zero for a while.
Dividing the group and the use of abilities which stagger a target are surprisingly effective as well. And so is just getting out of harm's way and denying that engaged range. But the general idea for lasting saber duells is indeed just having enough ranks of parry.
Either way, you have plenty of options and don't have to use the same tricks over and over.