A Magisk module wthich allow you to replace your original framework.jar. Can be used to spoof app signatures which is useful to let microG work.
Just put your patched framework.jar (You can use Tingle to patch it) in /path/to/module/system/framework and zip the whole folder. Then flash the zip you get via Magisk Manager or Recovery. After a reboot, check the microG Settings to make sure the patch works.
If you need a more specific guide, you may visit the post on my blog. Post
Just open a issue if you have any problem when using this module.(Though I think there won't be many problems!)