Like so many great brand names, Recaro has made a great product and then found profit in selling their name to be put on whatever minimum level seats with none of the features that made them something good. Poor side and lumbar support with permanent butt groove deformation after a few thousand miles is a bad reflection on anything Recaro.
I think swapping the whole seat is the best idea. Pull the stock seats before they are squashed and reinstall when selling to a collector in 10 or 20 years.
I made a 10" high 2" thick, teardrop (crossection) shaped leather covered foam lumbar support that fits between the side supports. I used a 2" strap running through the support and around the entire seat back to hold the support and allow it to be raised to the best position.
Roy