#1, a Manfrotto 222 or 322 head will add a few inches (8 or so) to the height of the monopod (the 322 will need the platform moving but that's an easy job). (IIRC, Calumet do a cheaper version of the 222)
#2, an extender could be made up to sit between the top of the 'pod and the bottom of whatever head you plan to use.
#3, an extender could be turned up to push into the bottom of the 'pod to raise it to the required height.
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