That is exactly what I did, and don't regret that at all. That crew is just great and can do wonders on the melee side of the moon. It's only backdraw if the fact that only Taelor can take a beating and still keep fighting, as all the others are plain glasshammers.
Adding Hamelin to that list will allow you to get some really needed crowd control on the table, with some neat tricks. It is kind of expensive on soulstones tho.
The Convict Gunslinger is always welcomed, and do his job really well, something to consider.
From that, Freikorps will be a great addition to the crew, giving some nice ranged firepower. They are strong vs Wp heavy spells and effects, so really helpful when fighting Pandora, p.e.
As others said, many will argue about getting Bishop and Johan, as the first is really expensive and not a heavy hitter, and the other is similar to Taelor, but not as good, imo.
Anyway, as you can see, there are plenty of options to take with the Vikkies, but most are from costy to expensive, so you won't be able to field many at the same time. This will change somewhat with the Desperate Mercenary, but not much if you ask me.