Shock from coilover and from normal shocks are design differently.
That's why the real coilover needs to rebuild over times because the abuse they actually get.
The normal shock has a longer life, but there is a travel distance they were designed to work at. So that's why a lot of people would not recommend stock shocks with lowering springs. I know that he is going with aftermarket units, but that is still not a real coilover. If you really want the adjust ability, getting tein basic will be a way better choice.

The biggest thing is how often you are going to adjust it. I have a set of KYB AGX and I have only adjust it once. We are talking about turning the knob. It is not like he is going to take off his wheels every week/month and put it 1' higher...