Quarantine/TTM Help (Canada)

We just lost all our fish to brooklynella after not quarantining a wild caught fish. Tough lesson, but obviously needed.

Being in Canada, I don't have access to most fish meds. What I do have access to is Rally Pro and CopperPower. I'm wary of using copper because we have tanks with inverts on literally every floor. I know it's unlikely that cross contamination would happen, but -anxiety-. This led me to the hybrid tank transfer method.

Could I do the httm but with Rally Pro baths every three days instead of peroxide? I have access to it but would feel safer with an actual fish product.

Please don't be afraid to tell me this is a horrible idea if it is btw. I'm basing it off folks saying peroxide OR a formalin bath for httm, but I am a newbie still so I know my logic could be wrong.

Thanks for your help!