Using 301s to get deep links

Hey guys,
I've had an idea bouncing around in my head for turning homepage-only directory links into deep links. Lets say I have a client who trains a wide variety of pets. There are some dog training specific directories who will only link to a homepage (no deep links). So I get an exact match domain like dogtrainingcourses.com so that I can use 'Dog Training Courses' in my business title (which becomes the anchor text), get a whole bunch of these to my my site (simple 1 page wordpress site).

Then do I:

A) simply 301 the whole domain to my clients deep page on dog training courses. I assume that majority of the link juice will pass, but how about the keyword relevancy?

OR

b) Rather than 301ing the whole domain, just have a single link on the homepage with 'dog training courses' linking to clients deep page (like a doorway page). Only trouble is I don't want this buffer site to rank (which it no doubt will).

Oh and please no one start arguing that directories are useless etc, focus on other types of links etc.