Unfortunately unless it's a really expensive card walkthrough isn't really feasible. I know what you're saying though. Express isn't too bad as long as the box is marked and it's seen and opened accordingly. Once you hit a certain price point the ROI doesn't make sense though as CSG slabs aren't the highest on return.
For example, subbing a $5-10k card through WK with CSG, you might as well sub through a company with higher return for $100 more unless it's for personal collection. I'm not saying CSG is bad, but the market just doesn't value them as highly.