Create lens profile for ultra wide angle lens

Hello,
I am trying to create a lens profile for the ultra wide angle lens Olympus 9-18 mm (Crop factor 2). As i use the lens for timelapse, i only need the profiles for 9 mm and open aperture f4, but combined with several different ND-filters which show different vignetting depending on their filter strength. Filters are oversized, so no influence by fringe. What i need is to get rid of vignetting.
So far everything works out well, and probably good enough for still photography. However for timelapse I need a high quality compensation of vignetting, otherwise getting flicker.
My problem is, that with the ultra wide angle lens distance from camera to chart (A3) is just about 0.5 meters.  I did the shootings outside, in shade, when having a clear sky, and I found it quite impossible not to produce any shadow of myself or the camera on the chart. Thus I got a not perfectly even correction of vignetting.
Can anyone give me tips how to solve that problem with producing shade on the cart? Maybe working indoors with 2 lamps can create better results? Have tried that but found the illumination of the chart so damn poor.

I think your best bet is outside, with possibly a larger chart.  (The two-light setup indoors is problematic esp. with wide-angle lenses.)
Instead of waiting for overcast, try waiting for a sunny clear day with a direct lighting from the sun on the chart, at a sharp angle (almost side-lit) so that the chart is clearly illuminated, but the shadow that the camera casts will be to the side (instead of on the chart itself).

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