Heroic I find is great for offline installers. I actually prefer it to Lutris I think. You set up your application and it creates a prefix. Before selecting the executable you press the "run installer first" button and it runs the installer on the prefix. Once it's done you select the executable and it's set up and good to go.

The Lutris method, IIRC, is you create the prefix, select the installer to run, then you modify that to target the new executable after. It's not difficult, but the Heroic experience is slightly more streamlined I think.