If I have to input it into someone's website, it is not truly local.
Browser extensions are pure evil and a hackers wet-dream, so I don't use those for authentication.
So, I think I am out of luck. Which is fine, as long as HIVE is working properly.
If they ever allow just a posting key, then I would reconsider. Otherwise, I don't like the risk calculus.
How are you using Hive.blog?
I have to put my key into the site. But the site is foundation of trust, as it was created when the fork occurred. It is a first party. Any layer above it is a higher tier party, and therefore less trustworthy.
I.e. logging into my banks website is much more secure than logging into another website that will log into my bank.