Yikes!
The valk, and motorcycles in general can easily negotiate that kind of obstacle...you just can't "ease" into it.
When crossing "up" just keep on the speed and turn firmly/sharply in. Not too easy, not too sharp...too easy and you can lose control as the bike "trips". Too sharp and the steep bump can be jarring (and possibly throw you or help you lose control).
Just right and the tires will "climb" the rise with authority and the bike won't so much as bobble. I've negotiated as much as a 6" rise with the valk without any hint of a problem. seems like 30-40 degrees seems to work the best on the Valk.
It does take practice though to know the right angle...higher speeds actually help...I think they should teach this in the rider's courses but I don't recall that they do.
But... when in doubt, or when not CONFIDENT, stay in your lane and live with whatever speed you're stuck at.
I had something similar on my way home from virginia recently. Thery were paving the WV turnpike, and only one lane was done. I could not tell for SURE how big the lip was... so, at speed, I felt it with my boot before executing the lane change. I just couldn't SEE it.
Jabba