Making an Ancestry with a third hand. How to do it?

So, I am making an ancestry with a third hand, and I am unsure how to balance it. I really want to do something with the Starfinder 2e extra hand rules, but just having three is (as far as I can tell) basically just the same as having two, since switching hands is one action and swapping gear is also just one action.

Also, this is not just a "third arm," but a hand on the end of a long, prehensile tail. One thing I'd really like to be able to do is have the tail wield a two handed weapon by itself, but I don't know how to balance that at all (was currently just going to say that it can wield a two handed thing if both arm-hands are inactive)

As the ancestry progresses, I want them to gain more benefit off of the inactive limb, like using interact actions and such, but I don't know how to phrase it to make it useful but not overpowered.