Total engine damage after 30,000km

I’ve already read a lot about the blessings of the new, completely revised 2.0 turbodiesel and would like to contribute another episode: We were surprisingly stranded with our 2018 motorhome at the end of April: Rugging while giving gas, then only power up to 60 kmh, after a short distance it went down to Vmax of 20 kmh. No smoke, no interference, but bubbles in the cooling liquid tank when giving gas. Towed and the workshop said: injector defective. Then ha It took them 1.5 weeks to separate this from the engine block without any accident; it was totally coked. So today the rescue call: Injector is out – but pistons are shot. After 30,000km, with absolutely moderate driving mode (Vmax=100 kmh) and 4 times oil change within the period. Just as I read this, a total damage at this mileage seems to be nothing unusual. The repair workshop far from home calls for the installation of a replacement engine about 9000 EUR. Ford in the village says 10,000 EUR PLUS. The first repairer offers its services for 8000 EUR. EVERYONE I called said “Oh, we know that!”. Apart from the fact that I could constantly beat my head against the wall about this, the question remains: What to do? And (I hardly dare to ask) there may be any more cost-effective alternatives – apart from the big press?