If the unit is general (especially the Disabled Persons' Federation), then I think it is necessary.
Turning to civil servants is the right way, and there are more opportunities for promotion.
The same is true for many professionals to take the civil service exam.
It is not easy to be promoted in public institutions, and I believe you have the same experience. You're approaching retirement age, so it's estimated that you'll be promoted before you retire after you become a civil servant. It is not difficult to get a deputy.
If I were you, I would not hesitate to transfer to a civil servant. If you want to eat Chinese food, you have to go higher. If you don't seize the opportunity, there may be fewer such opportunities in the future. Maybe you are a little old, but considering that there are still a few years to retire, many civil servants will get a better salary when they reach retirement age. Although it is only a nominal position, they can enjoy treatment.
Personal opinion, for reference only!