Hi and welcome
Interesting point about scrapping Fronteras but unfortunately its a sad fact of life (not just Fronteras but loadsa other vehicles) that they are worth more in bits or they become uneconomical to repair. If you look back over the years at the cars that have been scrapped its enough to make a grown man cry
These things go in cycles, I spent 6 years working for a Triumph specialist in South Wales and back in the late 80's we were scrapping Spitfies/GT6's/Heralds/Vitesses like they were going out of fashion but at that time it was difficult to get the parts to keep the cars on the road and it wasn't financialy viable to restore most of them. Things did change and by the turn of the 90's values had risen significantly and some of those we broke would have been worth restoring and then prices crashed again as the investors ran for the hills.
The 1 upshot of the climb in values was that lots of firms started remanufacturing spares. Body panels and trim bits that were unavailable new for many years were readily available as there was sufficient demand to justify either repairing the old tooling or make new however these days most of the specialists that sprang up back then are long gone as the demand isn't there anymore at least not in the volume of demand as there was in the 90's
Unfortunately I can't see the same happening for the Fronteras, their prices might rise in years to come but only when there are very few left and while mechanical parts may remain easy to come by trim & body panels etc not so
The reality is we need a number of Fronteras to be broken to supply spares for the ones that are in daily use