Or you can debuff Jukai Kotan
But in all seriousness, I don't use the elemental KG at all so I don't have a valid say in the matter since I rely mostly on the doujutsu-based techniques (sharingan, rin'negan, etc.). Each KG within their category are supposed to be as balanced yet unique from each other, so making it more and more like Senju's moves would essentially lose that difference in variety.
Since i'm not familiar with the Hyouton moveset, i'm assuming it only lasts 1 round but is super powerful. Making it last a couple of rounds may not be too bad (as you suggested), or perhaps lowering its chakra cost may be an option as well, though I don't even know how much it costs. Unfortunately it probably wouldn't be a priority on Neji's list to update since it's not that popular a KG set assuming he even looks at this thread, but it might not be a complete lost cause seeing as how Hyuuga may possibly be getting an update (but that was a WIP/issue since forever). Don't get your hopes up though. XD