I have not personally tried this out, so I can't verify if the necessary info is accessible or not. Could you extract the purchase date from the receipt and us

I have not personally tried this out, so I can't verify if the necessary info is accessible or not. Could you extract the purchase date from the receipt and use that as a basis to determine which features to enable, providing IAPs to unlock the rest? At a certain level it may be too cumbersome under the hood, especially when compared to the traditional update method of providing an entirely separate binary, but it could work by also providing a means for bug fixes on "older" versions without additional labor.