1 recipe except for
Is it possible to have rubber saplings generate at least one in each of its recipes?
There is no way for me to complete the loop.
Or, stop consuming saplings?

There should be a recipe that looks like this, which you can generate saplings from for use in other recipes.

Maybe each recipe could be done in the same amount of time and shorter, how about 1 minute?

This one seems to make no sense, why not add the other three recipes all with a fixed sapling output.