..it doesnt look like you can separate them again later?
That depends. Do you understand how to undo a right-hand nut from a bolt or screw? If not, then ...
I suspect a wire nut can be made so that the twisting force can only be applied one way, but every wire nut I have encountered can be unscrewed. It is not always easy, but it can be done. Reassembling is always easy. In any event, it is easier than unsoldering and then trying to redo the soldered joint.
With solid wires, as used in mains wiring, wire nuts work great. Wago types also work. For stranded wire and mixed stranded/solid I prefer Wago-type, but also use wire nuts. The problem with wire nuts and stranded wire is the damage to the wire when needing to reconnect. In any event, it is not as bad as re-doing twisted and soldered (IMHO).