Is it possible to obtain default implementations through dependency injection of extensibility points?

I'm working with 3 of the optional service factories here: https://identityserver.github.io/Documentation/docsv2/configuration/serviceFactory.html

I am in a couple scenarios where in some cases I want my own implementation of a factory to be used while in other cases I'd like to fall through to the default implementation. Right now since all of the types needed to instantiate the default implementations are registered within the DI container, I have the ability to simply subclass and have something like the following:

public class TokenService : IdentityServer3.Core.Services.Default.DefaultTokenService
{
    public TokenService(IdentityServerOptions options, IClaimsProvider claimsProvider, ITokenHandleStore tokenHandles, ITokenSigningService signingService, IEventService events)
            : base(options, claimsProvider, tokenHandles, signingService, events)
    {
    }

    //...

    public override async Task<Token> CreateAccessTokenAsync(TokenCreationRequest request)
    {
        if(...)
        {
            // I want default implementation, so fall through:
            return await base.CreateAccessTokenAsync(request);
        }
        else
        {
            // my own implementation
        }
    }
}

I'd like something different, like just taking a single object if possible (other suggestions also welcome!):

public class TokenService : ITokenService
{
    ITokenService _defaultService;
    public TokenService(DefaultTokenService defaultService)
    {
        _defaultService = defaultService;
    }

    //...

    public override async Task<Token> CreateAccessTokenAsync(TokenCreationRequest request)
    {
        if(...)
        {
            // I want default implementation, so fall through:
            return await _defaultService.CreateAccessTokenAsync(request);
        }
        else
        {
            // my own implementation
        }
    }
}

I've tried doing the above but the DI container doesn't know how to hand the DefaultTokenService to my class. Is something like this possible?

IdentityServer / IdentityServer3

Is it possible to obtain default implementations through dependency injection of extensibility points? #3411