In most cases this is not an issue.
Many standard lenses can be focused "beyond" infinity on many camera bodies (meaning the modified camera + lens can still reach focus at infinity).
Usually modified cameras are used on telescopes or lenses designed for astrophotography, where the problem does not exist.
In the past I modified many lenses (mostly old Pentax/Zenith lenses or Canon FD to fit Canon body. So when I was re-assembling the lens, I was usually able to adjust focus as well, if needed.
However, to start playing with AP, try with standard camera.. there is always time to modify it later.
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