I'd say 100% yes, since Helbrutes are simply a modeling evolution of....(drum roll please) a Chaos Dreadnought.
The Helbrute inherited its weapon options, special rules (such as going berserk), etc. directly from the Chaos Dreadnought of old. Most notably it shares a 100% match for the basic dreadnought stat-line. The 'Helbrute' name is just
GW starting to try its hand at obnoxious overly-silly names applied to things.
I'd just make sure your weapons are appropriately modeled to represent the Helbrute's equipment. I don't think you'll find a single tournament who would have an issue with this.
It is worth noting, sadly, that somewhere along the way the Chaos Dreadnought lost its combi-weapon (shown in the shoulder/chest above) that used to be a weapon option for these guys.