Hey, I think that your voice is really the highlight of this scenario, it's really distinct and it's definitely not something you should compromise. If you've listened to the Pretending to be People podcast, they also run Delta Green in their own weird setting and it works really well. Especially for community creations, I think really experimenting with Delta Green's tone and style is dope.
I would really recommend checking out Kult, it's really perfect for surreal, magical horror and conspiracy stories. If you do write your own setting it has some cool ideas, it's a whole different approach to Delta Green but shares that kinda gritty, bleak style of horror.