I did this a few years ago.

Maybe the best option is to create an entirely new prefix in Heroic and install battle.net via their “run installer first” button. Via Winetricks GUI you can install the 2 fonts or whatever that the lutris script installs.

Then, copy the game files of StarCraft 2 or WoW or whatever to the new prefix program files.

Then, in battle.net, it will either auto-detect the game, or you can go through the “search for games” flow in settings.

That should work, it is always better to have a fresh prefix as it takes almost no space. Once everything is copied you can simply delete the old one.

I’ve already replaced lutris with Heroic launcher + proton and wine-ge a year ago.

Lutris install script already didn’t work >50% of the time for me and battle.net always completely corrupts and messes up after a time on lutris and I have to reinstall it every few months, but has been going a year strong on heroic.

You can also always look at the lutris install scripts and install those components in heroic via winetricks. They were made by the community anyway.