Hey! If you're cool with a disfigured/scary-looking vampire, we could do some sort of drug addiction metaphor with an old character of mine. I saw the disfigurement thing in the tags, so I thought I'd offer him to you. He used to be a fairly faithful Catholic in the past, so we might be able to do something with a pastor character as well if you're cool with it.
I haven't done historical settings in the past, but MC is fairly old, so he could fit into a Regency-era well, but my lack of knowledge about the era might things difficult. If you're cool with some inaccuracies, we could go with a low-fantasy setting, or I could do a bit more research before we start.
Please send me a PM if you're open to anything I mentioned!