My company closed my home office while I was away on an expat assignment. Now they are pressuring me

My company closed my home office while I was away on an expat assignment. Now they are pressuring me to accept a change to my assignment and a new agreement that is less favorable to me. I am an American. The company is French-owned but incorporated in Ireland. My contract says that Florida law governs. I am in a protected class on two criteria: my gender and age. No fewer than three people in the management team has made comments indicating they will not necessarily provide benefits in my current agreement or that some shady selection criteria are being applied. For example: I was told by former manager that everyone in my department except 2 or 3 low performers were offered a job and a severance package to choose from. I was offered a disappointing job. When I asked what the severance package is, my old manager said he would get information to me but none is forthcoming. The new manager said that they are actually not required to offer me severance, implying that I would be treated differently than my peers back home have been treated. My contract says that I will be repatriated to a US job subject to the availability of a position. I have been shown org charts wtih no fewer than 6 empty spots and had a conversation in which new manager said I would be qualified for those jobs but more useful in a job in Ireland. In a conversation 3 days later, I was told there are no jobs available in US, even in the same conversation where I'm told about how the work is not progressing right now because of a lack of people in the jobs there. I asked why the original more favorable job offer was replaced with a less favorable one. New manager agreed that I could do the job easily and the person they placed in it instead lacked a key qualification for it. But they didn't want to lose the other guy, he can't travel. In a 2nd conversation a week later, new manager's new boss told me that he thought a 30-something person is more inclined to stay for a long time but a person in their 50's is likely to leave so he would prefer the first. I am an American, age 52. The person placed in the new job is an Irish national probably in early 40's. My old manager, is now pointing out that the company can end my current assignment, implying that if I don't sign the new agreement, then I'd have nothing. But my agreement says that if the employer chooses to end the agreement early, I will be repatriated to a US job subject to the availabilty of a job -- unless I am fired for non-completion of duties. So i suppose the threat is that they will make up some reason why I am not doing a good job. What protections do I have in this case? If I find a new job outside the company and leave before I am let go without severance (because I will surely reject the very bad offer they are making), have I forfeited any rights I do have? Because the whole reason I feel compelled to leave is that I am hearing so many insinuations that the company will not honor the terms of the contract they have with me. If they complied, I would stay.