Able to pick either a time or a team member

[EricShreve]

I am a member of a training team.  What we would like to be able to do is to have a way for a client to have two choices when scheduling a training time.

1. Select a particular trainer and then select the best time according to their availability.

2. Select the best time available, and let the "any host available" option select the trainer that has availability.

I'm having trouble getting both options to work together.  I can setup the any host available option and it works.  I tried using a routing form to allow for selecting between the two options above, but I can't see a way for an option that is selected to link to other team members' calendars.  It can only see mine.

Is there a way to accomplish what I want to do within one scheduling link?