The good thing about that video is that you and Serge both have S1s. The bad thing is, as you say, he is dealing with a frame that is not bonded to the body yet. IIRC, one guy made shorter drop links and then connected it similarly to the shock bolt or even somewhere on the lower A-arm. I'll look some more and see if I can find something.
But you're still left to protect your fiberglass underside. You've probably already thought of a skid plate made of galvanized sheet. Another option is to get adjustable shocks and raise the ride height with them. After that, other than inventing a hydraulic lift for the bottom spring perch, I think you've pretty much run out of options.
Do you have any idea how much you want to raise the front?