Viable hybrid assassin option?

As so often, that depends on what you mean by "viable".

Blade Fury and WoF in and by themselves can absolutely be used to clear hell so they're viable in that sense. Though both do suffer against immunes, so long as you don't have a sunder yet.

Combining both would help against the respective immunes but will also inevitably make at least one of them significantly weaker than it would otherwise be as you simply won't have enough skill points to max all of their synergies. That's true even at lvl 99 but especially true at your level.

If your general desire is merely to combine traps with more active gameplay, rather than specifically having your heart set on WoF, a

Death Sentry bladesin would generally work far better.
Unlike WoF, DS is quite the 1pt. wonder. More points certainly help for true screen clearing as it ups the radius but the synergies really aren't that important. One ups shot count which is nice but not critical, the other ups light dmg which is irrelevant if you use it to support your blading via the exploding. Even if you want to aim for max range and do include some support points in shadow disciplines, you can basically finish that build up by lvl 79.
DS would effectively act as an area support. You'd bladesin your way to the first couple kills and then your Death sentries take over after hitting a critical mass in corpses and just blow up the entire screen.
That actually does leave you with a perfectly viable build overall.