Onno, I will acknowledge up front that I don't know you. I appreciate your attempt to explain your side of what happened on this controversial issue and I will also give you some credit for a willingness on your part to accept some lumps for what you now clearly see as a bad decision.
Let me be clear about something - I work with some individuals that crossed picket lines and some of them are even nice guys. That being said, they are, and always will be scabs. It is something that can never be erased or atoned for. They exist in a world much like someone with a disability - they get by, but their co-workers all know who and what they are.
Here is my take on your situation. The current state of the airline industry has pilots on the brink - physically, emotionally and financially. Pilots have had it with management teams that have pushed things too far. Pilots are now starting to push back and the Spirit Strike may be just the start of things to come. Your decision to fly this flight at this particular time will likely cost you your career in mainstream aviation. Your timing was as bad as your judgment. Pilots will see you as a spineless pawn being told (or tricked) by management to screw your fellow pilots - and you did it. You also have the disadvantage (unlike the 83-85 Continental Scabs), of being one name on a list of two pilots who flew struck Spirit work. Your name will be remembered.
I think I have a reputation on this forum for reason and common sense - at least I hope I do. That being said, my advice to you would be to consider other non-aviation career options. I just don't see any meaningful way for you to salvage the predicament you find yourself in.
Perhaps others can find truth and the importance of character in your misfortune.
I wish you well in your weighty decisions ahead.