I agree with the general instructions you posted. I left a post in another thread earlier today on the same general topic; shared lucid dreams.

That other post was suggesting that by focusing on an agreed dreamscape for a meeting location within the dream dimensions, specifically (sic) "the moon", the proposal that shared dreams are attainable, could be tested.

I said that I think the only way to do this is to first meet, face-to-face, for an extended period of time, preferably multiple times, within familiar, mundane SpaceTime.

It seems apparent to me that it is not the dreamscape location that will act as the nexus for a shared dream. It is each individual’s unique “consciousness vibration”, their “psychic fingerprint”, that may act as the “homing beacon” to guide the prospective participants to find each other once within those lucid dream dimensions.

Specifically, once inside the lucid dream state/dimensions, an attempt to recall the target individual’s “personality aura” (how many phrases can we create to describe this particular aspect of the individual?) may function as a transmitter that the other lucid dreamer can tune into.

This has worked for me too.

Of course, it involves a very personal commitment, and I do not recommend that this be undertaken lightly. A very gradual, circumspect, and long-distance introduction would be the only prudent way to proceed with people who are currently strangers.

As you began the initiation of the shared dream, you went through a list of people who you had previously had contact with within SpaceTime, which is exactly the point I am making too.

The initial contact in "ordinary", four dimensional reality is a prerequisite for any planned, shared lucid dreams. While comfortably already within the lucid dream state/dimensions, the "energy field of consciousness" of the target person is what you need to focus upon.