App Id is 'baked into' manifest, but our App Id is dynamic

Checklist

[x] I've updated to the latest released version of the SDK
[x] I've searched for existing GitHub issues
[x] I've looked for existing answers on Stack Overflow, the Facebook Developer Community Forum and the Facebook Developers Group
[x] I've read the Code of Conduct
[x] This issue is not security related and can safely be disclosed publicly on GitHub

Goals

I want to be able to specify multiple App's in the Facebook Settings file, and decide which one to use at runtime.

Expected Results

I can add Apps to my Facebook Settings without anything app-specific being 'compiled with' my game, since the app is yet to be determined.

Actual Results

The Android Manifest is modified with the App Id of the selected app index, though this might not be the app index we decide to use at runtime. We are concerned about problems this might cause, as the manifest has hardcoded app id values, ie:

<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="fb{hardcoded value}" />

And our app might never initialise with this App Id.

Steps to Reproduce

App multiple apps, build the project. The App you intend to use may not be the one that is 'baked into' your manifest.

facebook / facebook-sdk-for-unity