GeezerVison

This distinction is taken from https://www.apache.org/foundation/how-it-works.html#developers

I think that something like host team members is fine. Is this concept used somewhere in this article?

We're using that concept implicitly in lines 41,42 and explicitly in line 55.
Also, we're announcing to use the concept extensively in line 85.

And since home/guest might establish a mental concept of separation (us/them) I think that we should give that a aspect a consideration to see if and how we want to deal with it throughout the content.
This could enhance clarity and prevent contradictory information later on. (Me being a nitpick and definition pedant here ;))

I've suggested the Apache source below since that gives an example for this

I think in a corporate context we assume that division is already built in by the organization. We want to bring it together and suggest the terminology of Host/Guest to encourage people to give warm welcome and collaboration to each other.

Sounds good to me.
So we're using host team member for a person that is part of the host team but no trusted committer (yet) then?

Yes, I think so.

We're using that concept implicitly in lines 41,42 and explicitly in line 55.
Also, we're announcing to use the concept extensively in line 85.

And since home/guest might establish a mental concept of separation (us/them) I think that we should give that a aspect a consideration to see if and how we want to deal with it throughout the content.
This could enhance clarity and prevent contradictory information later on. (Me being a nitpick and definition pedant here ;))

I've suggested the Apache source below since that gives an example for this

I think in a corporate context we assume that division is already built in by the organization. We want to bring it together and suggest the terminology of Host/Guest to encourage people to give warm welcome and collaboration to each other.

Yes, I think so.