running a HTML5 export offline - without a web server

I know that the HTML5 exports from C3 need to be served on a web server to run and I've been hosting them on a local server with no issue. However, I've run into a scenario where I need the HTML5 export to run offline, without being served from a server. My HTML5 activity needs to be imported into a third-party application - to be viewed offline. I run into the JS MIME type error and I understand why I'm getting the error. Is there a way around it? Can my HTML5 export be run offline for the purpose stated above?

This error is exactly why you need a web server.

If you want to run a game on a local desktop system offline, then the best alternative is one of the desktop exports (e.g. Windows WebView2).

I understand that it needs a web server to run. What I'm wanting to do is to import the HTML5 export into another tool and use it on that platform. It's imported as a HTML5 activity into the other tool. It won't except the desktop export options. If it won't work then it's fine, I'm just wanting to know if it's possible or not - and it looks as though it isn't a viable option at the moment.

This looks like it's only applicable to C2, I was unable to apply in C3.