Sounds like (assistive access)[https://support.apple.com/guide/assistive-access-iphone/welcome/ios https://support.apple.com/guide/assistive-access-iphone/welc.

Sounds like (assistive access)[https://support.apple.com/guide/assistive-access-iphone/welcome/ios https://support.apple.com/guide/assistive-access-iphone/welc...] is what you want as it solves both of these. It gives full app placement control to you and an always on screen back button.