Simple reality is that BBFS is what a lot of people want and a lot of girls willing to provide. But even before it was openly offered it was happening -- you just didn't see it -- so not entirely clear just how much the risk level has shifted. So, I don't think you're going to find any of the agencies deciding right now to specialize in covered FS and lose a lot of money and customers. Just look for the GFE only girls and you'll have the experience you want -- a girl you think is lower risk and may or may not be offering BB to customers she likes.

 
Or if you are just not willing to expose yourself to the risks now, maybe look into the SB world (may or may not be an improvement there) or maybe look into other options and the Asian agencies here.

That issue doesn't exist with them. As far as I know they're an all Korean agency.