TD. If during the three plus hours a twin on one engine is exposed when heading for an alternate are you suggesting there is no chance of the remaining engine failing?
Would it not be operating at a higher power level?
Surely there would be a small measurable chance of a second failure?
If that was at night over a rough ocean could that have serious consequences?
Look left. CASA quotes 9a to prevent GA moving to lower costs. Look at ADSB and part 91.