If there were no commercial ramifications you could use amateur radio licenses. People already talk to the ISS, bounce signals off the moon, etc. All you need is the ticket.
Not legally.
Instead of "guesstimating a timeframe
It's not like rocket companies have unlisted phone numbers or won't take a phone call from the FCC.
A failure on launch could result in releasing radioactive fission products over large areas.
That's why it's unlikely until we start to mine uranium on the Moon. (Not so much the chances of an accident but the perception.) I had a discussion about that with engineers at JSC, and everyone in the room agreed with that statement. Fortunately, finding uranium on the Moon is not out of the question. We know it's there.
Arithmetic is being able to count up to twenty without taking off your shoes. -- Mickey Mouse