Question regarding dynamics

I’m working on a sousa-esque march and would like to have voices play at different dynamics (softer on the first refrain, louder on the second). Similarly, I’d like to tacet some instruments on the first refrain and have them enter on the second). Other than writing out the repeat sections with what I want to hear, does anyone know how to do this? Thanks!

Dorico does not (yet) allow different playback on repeats.

My solution would be (for playback only) to create a duplicate file (retitled playback only), add the measures and copy and paste the repeated section and change the dynamics.