I use Aurora Store to anonymously download and update apps on Google Play store, all without any Google Play services (I run GrapheneOS). Signal app on my phone is basically the same APK on Play store.
Have you compared it to APKPure? Just wondering which "store"/repo is more trustworthy, because recently APKPure have shifted to apkx format, which is natively unusable without their own installer app.
Aurora gets apks directly from Play Store via reverse engineered api