Chiming in to drop the links to my builds mentioned above 
o) The Fluffy Squishy - Pet Conjurer
o) Will O Wisp - Pet Cabalist
And yes, they both should be fine for HC and for all content.
However, I must let you know that there is no build in existence where you can do everything safely without worrying about dying. So care is still needed and there is still the risk of death if you make too many mistakes.
But that mostly only applies to Superboses Crate of Entertainment & Callagadra and also Higher shards of Shattered Realms (like 80+).
But anyways, if you want even more builds, you may also check out this:
^ That is a new addition to my build collection and is similar to my Will O Wisp, but might be a bit trickier to get used to due to Reap Spirits being the only pets. And that is especially true in Crate of Entertainment fight as it took my multiple tries(deaths) to get the hang of it there though it cleared all other content without any trouble.
And for a ranking of the 3 builds for HC, personally I would say; Fluffy Squishy > Will-O-Wisp > Ishtar.
(Also, if you plan on doing Crate of Entertainment, beware of the Maggots. They can one shot you. Take it slow and clear them out 1 by 1 or you may find your run cut short before even reaching the Superboss 
)