My surprise was legendary when I saw the car you are considering has the Combined FE of a 1st Gen Honda Insight!
If your Fiesta is going downhill quick and you can get the Suzuki for bread crumbs, then I don't know what is stopping you
Of course, the cost of parts and repairs for the Suzuki need to be considered. If the Fiesta is as popular as you say, then the part might be cheaper due to simple supply and demand.
I approve the Suzuki though! P.S. Get some Bridgestone Potenza RE92's on that thing asap if you get it!