I’ve been thinking about your requirements further.
My link dipole consists of a few components. A dipole T piece that is used to attach the dipole legs and has about 6in of coax ending in a coax socket, a run of coax with coax plugs on each end, 2 dipole legs with the links. I did it like this so it breaks down for easy packing and you don’t end up with tangles etc.
fix the fishing pole (fence or guys at about 1m AGL)
add the T piece to the top,
add each leg and walk each leg out horizontal laying on the ground,
attach the feede
push up the pole
walk out to the far ends at attach to fence with 1m cord or guy out and use walking pole to support ends
Nothing fundamentally clever or cool there. In your case if you have the two dipoles’ legs laying on the ground you can attach either set (mark them so you attacjh the matching pair!). Changing bands consists of dropping the pole, 10secs say, disconnecting the current dipole legs and attaching the others. With suitable lengths of cord, you can tie off both dipole legs to the same guy. Shouldn’t take more than a minute to swap antennas with a bit of practice.
No need to worry about interactions between antennas.