Remove index from url?

I have a client and we intended to build a responsive website and mobile app. We use parameters as the navigation for the app. Now when we are at the end the client want to remove “index” from the url. Obviously this is not just a quick fix as i initially presumed with Bubble support telling me that i would need to basically rebuild the navigation of the entire app. This would also slow down the mobile app. Anyone know of any way to remove index from the url? Hide it? or change it to a different word like “visa”?

Maybe using some html or javascript? The app is a single page format