>I'd really like to have the iOS versiona nd tvOS version be separate products with the same name and different prices.
You can't get there from here. Quoting the docs...
Preparing Your tvOS App for the App Store - Apple Developer
https://developer.apple.com/tvos/submit/
"If your tvOS app uses the same app ID as your iOS app, the apps will share one name. If your tvOS app uses a separate app ID, you'll need to create a new name. Do not include the phrases Apple TV, tvOS, or ATV in your app name."
>Will I need to submit a new version of the iOS app?
If you want to free up the name for another app, yes. Update app 1 with nameA to nameB, then quick like bunny grab nameA for app 2.
>Is there any way to have a Universal App (iOS/tvOS)
What you describe is a 'Universal purchase', (a universal app is one that supports both iphone & ipad) meaning if a user buys one, they buy both. Assumes you've used the same bundleID for both.
>and then delete/remove the iOS side of it?
Might be an issue since Apple frowns on taking something away from users once they have it. You may want to use the contact us link below to check with support directly.
Not sure what you mean when you say you have to charge the same price, as pricing is up to the dev...you can raise or lower as needed.
If you're willing to bury the iOS component, then there won't be any related-driven sales, so it's not clear why you want to do that, unless it's just work you don't want to do. Maybe just freeze the iOS component and let it go away on it's own over time. Who knows, you might change your mind later.
