Well, you've asked a tough one--tough enough that I'm tempted to punt.
One thing that strikes me is that tech skills, as used by humans, implicitly suggest understanding the principles behind them. A monkey can push the button that launches the missile; he can even be taught to push that button when the bell rings. He does not know how to launch the missile.
There are wasps who make nests of paper; they make the paper. I treat papermaking as a subset of cloth. The wasp does not "know how to make paper", a tech 2@2 skill; it probably has a highly specialized bod 0@1 manipulate object skill that allows it specifically to turn scraps of wood fiber into a paper nest. Similarly, the bird does not design a nest, and could not decide to use its skill at weaving nests to create a different type--ornithologists can easily identify the type of bird that built any nest by the nest design--but only has a body skill of manipulating environmental objects into this shape that serves as a nest.
The beaver is a tougher one, but then, it is already using body skills to cut the wood and maneuver it into place, and the notion that it is not designing a dam but manipulating objects into a particular internalized pattern is not that far a stretch.
Now, the beavers in Narnia are a different story; Mr. Beaver is quite evidently a dam designer, and proud of his work. On the other hand, Mrs. Beaver bakes decent fresh bread, from what I'm told, so we're not worried about it in that case.
Looked at another way, if the person working the skill has no understanding of how it works, it's an @0 skill, and not only do @0 skills not give bias to the user, they are not limited by the world bias. It is not at all impossible for an indig in a 0@2 Psi world to be taught a Psi 8@0 Posturing skill--it's just extremely difficult for him to learn it. Thus it may well be that our bird has a T2@0 nest weaving skill and our beaver a T5@0 control waterflow skill, neither of which makes any difference to their bias or that of the world.
So those two solutions work for me. I don't see unintelligent animals having tech skills of that sort.
--M. J. Young