I know that you added a fs2crew voice.
Howvever, using the voice output of fs2crew to communicate on the beyondatc radio would be great. I do believe that it would require coordination with FS2crew. My thoughts are….
1) as FP i ask the Pilot monitoring (fs2crew) to request IFR clearance/inform holding at …
2) fs2crew then says the required radio communication (this would be the issue with fs2crew is that they would “have to hit a hot key”)
3) Beyond ATC then responds as if i had said it.