It is probably possible, but hugely complicated. We had a project using Dynamics which moved to ADFS, and required adding lots of extra code around refreshing tokens (code form autorefreshsecuritytoken.cs, deviceidmanager.cs and toolserviceproxies.cs from the SDK) and that was still using the SDK for everything.
Bare in mind you also need windows.identification installed in the OS which is another load of functionality to copy.
In the end you can always just use JustDecompile or similar to see what the SDK is doing.