And the answer is, one option looks like 300 nicka worth of seats, the other, 3 quid's worth of pen work
I looked at the same technique when I had t-sport seats in all fairness, but once you see GT seats in the flesh, there's no substitute. Aside from the Alcantara centres / red stitch, the outer leather is a different shade to the t-sport & matches the facelift plastics much better.
The t-sport seats also tend to sag & develop that god awful pleating/arse creasing to them, whereas the alc centres hold their shape & give a higher quality look. No sliding around through hard corners either.