Ok, I'll play devils advocate here. I am all about original, tight Alpines and Tigers. I have owned my Alpine for 44 years now, and my blood flows Rootes. I have of course "upgraded" my Alpine with Holbay engine and some mix and match of Series to what I think it the best of all combos. My Tiger doesn't have the original intake, carb or bonnet - though it is stock 260 and cam.
I'm not a huge fan of some of the more "creative" modifications people have done to their Alpines and Tigers. And I want to see as many saved as possible. We have an S2000 (full Mugen) and so love the engine. However, I think it is overkill for the Alpine. For engine alternatives, I think the V6 is great and John's Miata Pine is amazing. A full electric might be interesting.
However, let's be honest. Alpines are not ever going to be worth a lot of money. We're already past the sweet spot, and it's just not going to happen. And there are plenty of very straight, and complete Alpines out there for restoration - or just to get in and enjoy now. And to be further honest, this S3 is a bit of a mess. That front end is a disaster - a lot of money will need to go into stripping off all the bondo and reshaping the crumpled metal underneath. It's of course very incomplete. I'm assuming it has no notable history to consider. So I don't see that there is any good reason for you to wait to see if someone will "save" the car - mostly because I don't think there is any good reason to save it.