Great topic! For about a year I have been delving into the world of fine coffee, so I have been learning all I can about good beans and brewing techniques. I think that coffee and chocolate are a very natural pairing, hence the many coffee flavored bars out there.
What brewing method are you considering using? Yes, I think you're right that having the coffee hot is crucial. It also needs to be brewed in a quality way so that knocks out theubiquitous drip coffee makers or percolators. It takes some time to grind the beans, set up the equipment, and then brew it.
How many cups of coffee are you going to make? I assume you will pair several kinds of beans with one chocolate. If you had 5 types of coffee beans then you would need to brew 5 batches. I think it would go much quicker to have 5 sets of equipment ready to use. I guess a coffee cafe or a brewer would be the best place to do it so you have access to that equipment.
Just a few thoughts off the top of my head... I've been thinking of offering some chocolate and coffee tastings so this has been on my mind for a while.
Please keep us informed of how you progress.