A quick update on this. The bump that I had in mind is less tall at one end than the other, so I just cross to the other side of the trail and bump up that end. I don't worry about the curb any more either, it has a very slightly angled front. I did have one lip-biting moment yesterday when I misjudged the dropped curb that I was aiming at (at an angle) and realised that I was going to overshoot and hit the undropped bit instead. I got up it with no problem but felt very lucky!

Thank you again for the help and advice, much appreciated!