Actually if you are in this situation I’ve a simple github repository where I show how you can call the code through reflection
in .NET 6+ you can only use reflection and it will just work (Strongly Signed is not used anymore in .NET 6+)
In .NET 4.8 you still need to do some work to manually let referenced code to find the assembly since I was not able to fix this with only assembly redirect in App.Config (redirecting unsigned to signed seems not to work)