Good Morning,
I don't have your years of experience, however I've taken a look at this, and can't see that you are doing wrong. The approach begins at the IAF, which in this case is PAWNE at 5 DME, and from a track of 360 deg per the vertical profile part of the chart. You could not intercept the arc from the north as you would be in contravention of the vertical profile on the chart. You could not commence descent until you were within 5 deg of the arc at MEBLE.
I would state to ATC my intention to commence a procedure turn at PAWNE, but just for belt and braces, I cannot see how else you are supposed to arrange the aircraft onto the approach without doing the turn at PAWNE, unless they want to or state they will offer radar vectors onto the approach.
high-flyer