“HC viable” is not a label I generally slap on builds, because it’s meaningless.
Some experienced players can get any build through HC, others will die trying to facetank Voldrak every playthrough. Piloting and knowing what you can handle is more important, than a “HC viable” label.
That said:
This build a moderately squishy melee build, with only life leech for sustain and next to no circuit breakers as safety rails. If he dies, he dies.