Of course it's a problem if you are zone focusing. I wonder if you could simply add another focusing mark on the lens? Easier than manipulating shims.
With MF lenses on my Sonys, I think the focus peaking is about the best focusing aid I've ever encountered, better for me than RF or SLR focusing.
Col. Sebastian Moran
, ret. (not really)
In Classifieds Now: Nikon DX Fisheye
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Named "Best heavy-game shooter in the Eastern Empire." Clubs: Anglo-Indian, Tankerville, and Bagatelle Card Club.
Sony E/FE, Nikon dSLR, and iPhone digital. Misc film.
Birds, portraits, events, family. Mindfulness, reflection, creativity, and stance.