Jenni, that sounds delicious! (It also makes me think of Wallace and Grommit!).
What I've read is that, first, you need to avoid unpasteurized cheeses. Assuming your delish Wensleydale is pasteurized, I think it still tends to fall into the "soft cheese" category. Some of the books I've read say that we should avoid soft cheeses during pregnancy because of the fear of listeriosis. However, they do say that if you heat it until it's bubbling, it's safe to eat. Not sure that would work well with the Wensleydale, but if you fancy it, I'd give it a go! Just throw it on the Ryvita and put it under the broiler until it's bubbling, and see how it is!