Welcome to the forum.
I don’t have that particular knife, but here are a couple of pictures of a knife that is similar in design that you might try.
In the first example, I clamped a knife with a similar design that you describe. Instead of paper to help clamp, I use a thin piece of leather I cut from an old glove. Others use a piece of chamois, and Clay has reported success with moleskin. The leather example I show in the picture is holding the knife firmly.
An alternative in the second picture, is to clamp the blade near the heel, then adjust the approach to the tip by angling the knife. (I describe this a bit better in this thread.) In my case, I had to remove the thumbstud, but from pictures it doesn’t look like you’ll need to.
In either example, with this knife clamped I was able to reach 15 deg. per side without hitting the clamp. So perhaps try one of the above examples and see how it works.
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