OE design means no gas charged, the Koni 7610 is detectable by the adjusters.
Your center link may be a bit skinny, you can stiffen it for low cost with a simple sleeve around the center or a short piece of angle iron.
"Springs unmodified" sounds like you can remove the rubber donuts, which will lower the car.
Does it have a roll bar? If yes, replace the rubber with polyurethane. If not, is it legal?
