The varieties of leaf you have chosen are all pretty in-your-face stout flavors. BCA is about as far in the opposite direction from what you've chosen as you can probably get.
Your best bet is to get some quality burley and use the cavendish process. To get anywhere in the same solar system as BCA, you are going to have to case it with something fairly heavy in vanilla.
I've used this gent's process for cavendish, and it works well:
Making Black Cavendish Pipe Tobacco - https://fairtradetobacco.com/threads/making-black-cavendish-pipe-tobacco.637/
As for casing, here's a recipe I use and you can modify it to get you started:
(Makes a Pint - you can reduce for smaller quantity). It's worth noting that I didn't come up with these ratios. I ripped this recipe off from Ernie over at Watch City and modified it for my own purposes. He gets all the credit.
2 Cups Water
2 Cups White Granulated Cane Sugar
1 1/2 TSP White Vinegar
Some quantity of Vanilla - start small, perhaps in the 1/4 tsp range if you are using extract and then adjust to taste. I would add this after simmering too, as heating vanilla extract for extended periods could do weird things to it. Preferably, use whole vanilla beans during the simmering process for the best flavor.
Simmer all ingredients for at least 10 minutes to ensure they are fully dissolved - also gives time to allow the sugar to invert to prevent re-crystalization.
Spray 1 oz of casing per pound of tobacco mix(or ~1.8ml per oz of tobacco if you are doing small test batches). Mix by hand while you are spraying to make sure it's even.
Hopefully that helps a little!