With either injection pump, you cannot simply block off the injector line. Since the injector is a positive displacement pump, this will cause something to break.
In an inline pump you can simply disable pump elements by welding them into the fully extended position or grinding each cam lobe down.
Rotary pump? I am not sure how you could disable a single cylinder as there is only one pumping element on a swash plate.
EDIT: duh...it's easier than that. Instead of disabling the pump element, simply take the unused injection line and plumb it to the fuel return line (tank).
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