Walter. All Austro Diesel Engines use a torsional vibration damper between the crankshaft and the gearbox and vibration levels are monitored by the ECU. Ie:- the prop and the crankshaft are not hard mounted together.
Did I mention it's certified for Jet A1 and all it's aviation equivalents PLUS good ol' pump diesel.
I don't understand why your so anti diesels. Most certified airframe manufacturers are investing in some capacity into this technology. Clearly it is a valid pathway to reducing overall running costs.
Austro believe that after a few years of collecting data from in service engines there's no reason why they're engines couldn't have an 'On Condition TBO". They all have mandated oil analysis as part of the maintenance program.
Have you ever flown one?