Flippy I used that method a few times to install xapks on my xp3, but there might be problems when trying to modify it, without going into detail, you can't modify each piece because some are not a full app, and you prob can't just modify the main one because then it prob won't work with the parts that haven't been modified. I'm thinking that maybe you can work around it by installing the xapk on a smartphone (or xp3) using the above method or the apkpure app, and then you can extract the app to apk using an apk extractor.
