Hey, glad to be of service in the scaring department. Just that I figure the extra piece of housing tucked up against a stop that's clamped and cantilevered creates an additional stress point on the seat tube in the BB area. Just want to reduce that to protect the frame and having cable housing facing up from the BB in a curve is sort of like a water trap, unless it's an unsheathed cable housing like on venerable Suntour barcons that air-dry and drain. I'd grease the heck out of that cable and housing and replace it regularly on routine maintenance.

On the other hand, the under-the-BB solution works well, requires no braze-ons above the BB and is serviceable with no extended stress-bearing members. The derailleur cables actually keep the cable guide pressed up against the BB. And I have a drill and tap, which is why it'd be my favoured solution. So I have a hammer ... everything looks like a nail.