It’s not clear to me that there’s a meaningful way to interpret the statement that the forces “swap”. Presumably this means that the particles which are charged under the strong force would have that same charge under the weak force and vice versa, or something similar? One would have to restructure a much larger piece of particle physics to make sense of that, but it might be a fun exercise.
The problem is that the weak force is mediated by massive particles (The W and Z bosons) and the strong force is mediated by the massless gluons, but is in a confined phase (the force is so strong that you never see something that is charged under the force, only combinations of things that cancel out one another’s charges).
Maybe you could ask what would happen if the weak force was confined and the strong force was mediated by massive particles. I think things would look drastically different in that case, although I’m not sure about details. We would only be able to see a certain kind of electrons and neutrinos (the “right-handed” ones, but I won’t go into that). All of hadronic physics (the physics of protons, neutrons, pions, etc.) would probably be significantly different. This would be a fun exercise for a physics graduate student (who is not myself). Maybe I’ll think about it more later and write a bit more.