See you're only 45, Nickler, so your predicament is tough especially within the present C19 situation.
I'm sure we all appreciate your sentiments about present employment too. Your qualifications make sense to everybody apart from some suits who unfortunately are still as dumb with regard to experience as they ever were; only interested in the RULES as opposed to commonsense.
What is worse however is that some of these suits were once "US", line pilots who made it into management, were only interested in climbing the ladder and weren't necessarily that good when they were flying the line. So I'm sure we can sympathise with your feeling of disappointment and betrayal.
However, there are out there some companies with good middle management/training staff who will acknowledge your experience, value your expertise and find a way to put it to good use.
So, be assured that, with the way the airline business is turning out in the twenties, there is still a need for good solid training and refam., constructive testing and sound assessment of the new breed, maybe of the old-fashioned, 80s/90s sort. This could actually save the industry from destroying itself !
Someone will need you. Good luck.