well, you could just not use turtles and/or tweak the recipe for computers(though i have no idea how to do it, i know that it isn't hard)/ask somebody else to do it. also, redstone basically IS a computer - one you have to build first. you DO actually can control your factory from this programmable redstone-circuit-block. GT machines have redstone control/ there are redstone control upgrades for them. that plus something like project red(with the red alloy redstone cables)to make redstone transmission easy, allows you to (relatively easy) control your factory. maybe not from one block, but from a few. and complicated. but.
this.
is.
GregTech!
And, as we know, gregtech is the probably most complicated mod in existence.