2016 Cruze Limited
The new kits (3.4+) don't require any drilling; the only modification you have to do is cutting into the brake booster line. If you have an older kit, you might be able to get what you need in order to avoid having to drill anything - you'd just need some 5/16 and 5/8" hose and some spring clamps, as well as the little plug for the intake manifold check valve, and some glue dots to put the plug on a thin screwdriver so you can get it down in the hole and install it.I do have that PCV fix kit you mention but I never installed it got super intimidated by having to drill in the intake manifold. It's sitting in a drawer on my workbench.
You might not have to replace the valve cover; with the engine running, put your thumb on the PCV connection on the intake manifold, then listen for a squeaking/chirping sound, and use another finger to feel the vent on the PCV diaphragm on the valve cover. If you feel suction at that vent, the valve cover must be replaced. If not, the PCV diaphragm is probably OK, but excessive vacuum caused by a blocked hose will rupture it.
I recommend installing the fix kit as soon as possible, otherwise you'll have to continue replacing valve covers until you replace your intake manifold...in which the check valve is going to eventually fail anyway.