Perhaps, but this is likely to be a case where buying the appropriate product will work out looking better, and probaably a lot cheaper if I factor in my time that I can spend making the things I can't buy for £1.90.
Next suggestion then would be change from 110mm soil pipe to 100mm twin wall as they do the off the shelf item for that.
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Or does the gizmo in question contain and straight section of pipe that could be swapped for perferated pipe so the scent can come out the sides?
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110mm Pipe - Slotted or Perforated Drainage (Pack of 10) - Drainstore
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