Have a neighbourhood union rather than a labour union. Natural, real categories instead of DLS bureaucrat categories. Bonus: real unemployment insurance.
If you want job security, secure your job. Hire yourself to a lord, who, not being a retard, is much better at finding a job than you are. He pays you in perpetuity, and in return, he has the right to choose your labour.
Admittedly the exact details of the contract are a bit tricky. Ideally you would use this lord for other lordly tasks as well - arranging a lawyer, a doctor, a priest/philosopher, house maintenance, and so on. You don't want to have to change lords every time the job is suboptimal. You don't want a purely fixed wage while your lord can perfectly optimize your earnings, thus his premium. You don't want a purely fixed "union due" or the lord has no incentive to get you a job beyond the bare minimum. These things need to be carefully balanced.
But at the end of the day, a cooperative Exit society does permit changing lords. Shop around, get the best deal. Let experience be society's guide, rather than ivory tower theorizing.
That is, macroeconomics is easy. Trivial. Microeconomics is nutty hard.
The lord is not a bureaucrat. He makes his choices based on knowing you personally. Get a new lord if he's not interested. He doesn't see you as a checklist and some ass area he has to cover, but as an idiosyncratic profit centre. You can't scam his unemployment insurance. He knows or will soon know if you're getting fired for fault or because the company screwed up.
Because he knows you personally, it's healthy for him to have some sympathy. If you need time off, he won't deny it arbitrarily, based on politics or case law established by weird outlier situations. If necessary you can negotiate health conditions into the contract. Personalized, individual health considerations.
You can go full Commune if you really want to. Have the lord keep a central pantry stocked with staples, and you simply take whatever you want. You work where he tells you to, you rest when he tells you to, you play when he holds a festival. Don't have to think at all. Maybe draw a small cash allowance for luxuries beyond the free pantry. The option exists. In a genuinely free country, freedom is optional, not mandatory.
Two keys to all these wild benefits. Stop lying. Not everyone is a lord; egalitarianism is very false. Stop trying to be head traitor. Turns out treachery is bad.
You would think this is not a big ask.