Don't let the pictures fool you -- this is NOT Sebenco forward.
To be honest, I'm not entirely sure what exactly happened. All I know is that I was taking the final sharp right on Sebenco reverse, used a speed up, clipped a nub on the outside wall... and then suddenly I'm flying over the mountain. So, it would seem that you CAN get over the entire mountain without a forced respawn; the downside is that I landed facing the wrong way. Now, maybe you can work this into flying over it intentionally from the bump right before that turn and land on the other side before the tunnel.
All I know is that I wasn't able to finish the race because I spent about 2 minutes taking the photos and I imagine the whole turning around thing would have taken another 2 minutes as well taking the handling of my boat into consideration. Regardless, this was arguably the most entertaining thing to ever happen to me on this track.