I think I understand the concept of Impact Character hand-off pretty well, as Melanie explained it pretty well in one of the storymind videos, and there is a lot online about it too.
I also understand the way you can make an absent IC's present felt through memories or ghosts (like Obi-Wan), though if it's memories you have to be really clear how they are affecting the MC.
But I'm wondering if there is another way for an absent IC's presence to be felt -- through an agent? I'm thinking my IC and MC won't meet in person until around the end of the first Act. But could the IC and MC still affect each other anyway, learning about each other through intermediaries? Like if the IC sends another character as his 'agent' to the MC, influencing her that way. (This 'agent' character is not a hand-off IC; she does not share all the same story points as the IC.) And I'm thinking the M/I relationship could grow through that influence, with the agent reporting back to the IC.
For example, my IC Signpost #1 is Memories. I could have the IC discuss with his Agent about a past event where the MC was present (the never-solved abduction of her sister). The IC could ask the Agent to talk to the MC and see if she can remember details about what happened. Then something about those memories could trigger inspiration (M/I Signpost #1: Conceiving an Idea) in the MC, and the IC (once the agent reports back).
It sounds pretty doable ... and fun ... so I think I'll go for it even though I'm a newbie and should probably be careful not to bite off too much. Or do you think it would be easier/better to try and make a Hand-off work?