Thanks for the recommendation, Carson. I don’t have time to take on this project. That said, the code for the whitelisted iOS app linked earlier is still in good shape, and someone familiar with app development, especially React Native, should be able to use it. And I think the budget for this task is reasonable, especially if it’s for iOS only.
As Markus pointed out though, Apple may reject your app, they do explicitly say that they prefer not to have apps that simply serve a website, their terms also say that push notifications aren’t reason enough to warrant an app.