I hadn't heard about an accident to the Anastasia! I'm shocked.

I think Dan Dare would have fitted in just fine on the USS Enterprise, any series. The same kind of optimistic, essentially honourable, future is envisaged. (That'd be the way to bring him in - as a time traveller from a alternative time line.)

I seem to remember Digby having problems with a beam-me-up type transport device in the Eagle.