Well, I think you are right, and it´s given me hell on my bikes (all with timed breather disc) to route somewhere else without excessive spilling on frame, exhaust or rear wheel.
I might try straight down. After all, then you´re rid of it.
Does it leave much oil on the floor after a long run and do you have to top up the can?
When I used a timed breather, I don't remember any significant amount of oil coming out, or any visible effect on oil tank level, but there were usually leaks somewhere around the engine, which could have masked both effects!
At least trying it is cheap. The worst that could happen is it would lose more oil than you're happy about and you'd have to try something else.
I found that the engine leaked less with a big open breather.
Is there room or height to fit a hose which turns up, but is drained to the primary chaincase by a small T piece at the bottom of the U-bend? Has anyone tried that? Did Triumph ever try it?