Adding keyboard shortcuts in your SwiftUI apps is extremely easy. Just use the .keyboardShortcut(_:) modifier. When pressing and holding the command key, the shortcut will appear in the shortcuts list.
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With regular buttons from UIKit or SwiftUI, you are all set. With complex views, headings, or table/collection view cells that, when selected, bring the user somewhere else in the app or perform an action, you'll have to add the button trait.
In UIKit you can create keyboard shortcuts by overriding the keyCommands for your view controller, which is an array of UIKeyCommand. A bit of a different approach to how you'd do it with SwiftUI.
Images can automatically scale for accessibility content size categories, by setting the adjustsImageSizeForAccessibilityContentSizeCategory property to true, for any UIImageView you'd like to get its size adjusted. https://developer.apple.com/documentation/uikit/uiaccessibilitycontentsizecategoryimageadjusting/adjustsimagesizeforaccessibilitycontentsizecategory
