It sounds like a neat idea, Greg, and you'll probably get some participants who want to try it.
Sorry, as for me, I'll have to decline.
When I go to an area to visit lighthouses I've never seen before, especially if there is a great concentration in the area I wish to cover...I suppose I'm in the category of "speed lighthousing".
The object when I do this, is to see as many lights as possible in the time allotted...usually a vacation week or long weekend.
I think the mechanics you're talking about would add stress to an otherwise enjoyable lighthousing adventure.
However, I'm happy to pick up postcards along the way and share them later.
Judy